113 + Interview Questions in Alcohols in Chemistry – Class 12 Page 2 InterviewSolution

51.	Which of the following is not required for the conversion of trialkyl borane to an alcohol?(a) Diborane(b) Water(c) Sodium hydroxide(d) Hydrogen peroxideThe question was asked in my homework.I'd like to ask this question from Alcohols and Phenols in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct ANSWER is (a) Diborane The best explanation: Trialkyl boranes are oxidised by hydrogen PEROXIDE in the presence of aqueous NaOH to FORM alcohols. Diborane is not REQUIRED for this conversion but is ESSENTIAL in the production of trialkyl boranes.

Discussion

52.	If A and B are the C-O bond lengths in methanol and phenol respectively, what is the relationship between A and B?(a) A>B(b) A
Answer» The correct ANSWER is (a) A>B The explanation: The C-O BOND length in METHANOL is 142pm, whereas the C-O bond length in PHENOL is 136pm, which is slightly less than that in methanol.

Discussion

53.	Which of the following is given highest preference while naming when present in the same structure?(a) Hydroxyl group(b) Nitro group(c) Triple bond(d) Halogen groupThis question was posed to me in class test.I'm obligated to ask this question of Alcohols, Phenols and Ethers Nomenclature in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right choice is (a) Hydroxyl group Easiest EXPLANATION: FUNCTIONAL groups are given the highest preference while naming COMPOUNDS according to the IUPAC SYSTEM.

Discussion

54.	Glycerol is a _________ alcohol.(a) monohydric(b) dihydric(c) trihydric(d) tetrahydricThe question was posed to me in exam.My enquiry is from Alcohols, Phenols and Ethers Nomenclature topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct choice is (c) trihydric To explain: The IUPAC name of glycerol is Propane-1,2,3-triol, signifying that there are three hydroxyl GROUPS ATTACHED to three different carbon ATOMS.

Discussion

55.	Propan-2-ol can be prepared form the hydroboration-oxidation of propene.(a) True(b) FalseThe question was asked during a job interview.My enquiry is from Alcohols and Phenols topic in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct option is (b) False To elaborate: The oxidation of trialkyl boranes PROCEEDS ACCORDING to anti-Markovnikov’s rule, and hence the PRODUCT FORMED will be propan-1-ol.

Discussion

56.	Identify the catalyst in the hydration of alkenes to produce alcohols.(a) HCl(b) FeCl3(c) Pt(d) NiI have been asked this question during an internship interview.Origin of the question is Alcohols and Phenols in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» CORRECT choice is (a) HCl Easiest explanation: Alkenes REACT with water in the presence of a MINERAL acid as a catalyst to form alcohols. The H+ ion from the acid HELPS to form a carbocation for nucleophilic attack.

Discussion

57.	What is the IUPAC name of Isopropyl alcohol?(a) Propan-1-ol(b) Propan-2-ol(c) 2-Methylpropan-1-ol(d) 2-Methylpropan-2-olThe question was asked in a job interview.Asked question is from Alcohols, Phenols and Ethers Nomenclature in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct answer is (B) Propan-2-ol For explanation I WOULD say: ISOPROPYL alcohol has a parent CHAIN of THREE carbon atoms with the hydroxyl group at the second carbon, hence propan-2-ol.

Discussion

58.	What is formed when phenol is reacted with bromine water?(a) White precipitate(b) Colourless gas(c) Brown liquid(d) No reactionI got this question during an interview for a job.Question is taken from Alcohols and Phenols topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» CORRECT answer is (a) White precipitate Easiest explanation: Phenol on TREATMENT with BROMINE water GIVES a white precipitate which is actually 2,4,6-Tribromophenol.

Discussion

59.	If the C-O bond length in methanol is 142pm, what will be the C-O bond length in the given compound?(a) 96pm(b) 121pm(c) 141pm(d) 202 pmThis question was posed to me in final exam.The query is from Structures of Functional Groups topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» CORRECT option is (c) 141pm The best explanation: The SHOWN compound in methoxymethane which is an ETHER. The C-O bond length in ETHERS is ALMOST the same as that in alcohols.

Discussion

60.	Which of the following compounds is ethoxyethane?(a) CH3OCH3(b) CH3OC2H5(c) C2H5OC2H5(d) C2H5OC3H7The question was posed to me in an interview for internship.Question is from Alcohols, Phenols and Ethers Nomenclature topic in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct choice is (c) C2H5OC2H5 To elaborate: Ethoxyethane is an ether which is a DERIVATIVE of ethane with one HYDROGEN ATOM replaced by ETHOXY group (OC2H5).

Discussion

61.	Ortho and para isomers of nitrophenol can be separated by ________ distillation.(a) fractional(b) steam(c) vacuum(d) zoneThe question was posed to me during an interview.My doubt is from Alcohols and Phenols in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct answer is (b) STEAM Best explanation: o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding between O of NITRO group and H of hydroxyl group. On the other hand, p-Nitrophenol is present as associated MOLECULES due to intermolecular hydrogen bonding, thus making it less volatile. Hence, a mixture of both can be SEPARATED by steam distillation.

Discussion

62.	According to IUPAC, what is the suffix used for naming alcohols?(a) -al(b) -ol(c) -one(d) -OHI have been asked this question in a job interview.I want to ask this question from Alcohols, Phenols and Ethers Nomenclature in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right answer is (b) -OL For explanation I would say: According to IUPAC, the naming of ALCOHOLS is DONE by SUBSTITUTING the ‘e’ in the NAME of the alkane with the prefix ‘ol’.

Discussion

63.	What is the general formula for an aliphatic alcohol? (R=alkyl group)(a) R-H(b) R-OH(c) R-CHO(d) R-COOHThe question was posed to me in exam.Enquiry is from Alcohols, Phenols and Ethers Classification in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct choice is (B) R-OH Explanation: Alcohols are COMPOUNDS having OH group attached to an alkyl group and are HENCE hydroxy derivatives of hydrocarbons.

Discussion

64.	Which of the following types of alcohol contain a bond between sp^2 hybridised carbon and OH group?(a) Primary allylic alcohols(b) Secondary allylic alcohols(c) Tertiary allylic alcohols(d) Vinylic alcoholsI have been asked this question in a job interview.This question is from Alcohols, Phenols and Ethers Classification in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» RIGHT ANSWER is (d) VINYLIC alcohols For explanation I would SAY: Allylic alcohols are those in which OH group is attached to a sp^3 hybridised carbon adjacent to a C-C DOUBLE bond, i.e., an allylic carbon. Whereas, vinylic alcohols contain OH group attached directly to a C-C double bond.

Discussion

65.	Identify the simple ether from the following.(a) CH3OC2H5(b) C2H5OC6H5(c) C6H5OCH3(d) C6H5OC6H5I have been asked this question in an interview for job.The question is from Alcohols, Phenols and Ethers Classification topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» RIGHT option is (d) C6H5OC6H5 The EXPLANATION is: Since C6H5OC6H5 has the same aromatic ring on both sides of the oxygen atom, it a simple or SYMMETRICAL ether.

Discussion

66.	What is the correct relation between acidic strength of primary, secondary and tertiary alcohols?(a) 1°>2°>3°(b) 1°2°The question was asked during a job interview.This key question is from Alcohols and Phenols in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right option is (a) 1°>2°>3° The BEST I can explain: Alkyl groups are electron releasing groups and TEND to increase the electron density on OXYGEN and reduce the polarity of O-H bond. So, the greater the number of alkyl groups present, LESSER will be the tendency to release protons, and therefore weaker will be the acidic strength.

Discussion

67.	Propan-1-ol boils at a higher temperature than propan-2-ol.(a) True(b) FalseThe question was asked in examination.This is a very interesting question from Alcohols and Phenols in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right option is (a) True To explain: Propan-2-ol is a secondary alcohol and has some degree of branching COMPARED to propan-1-ol. This results in the decreases in surface area and VAN der WAALS FORCES and hence reduction in boiling POINT.

Discussion

68.	Name the following step from the mechanism of acid catalysed hydration of ethene.(a) Protonation(b) Electrophilic attack(c) Nucleophilic attack(d) DeprotonationThis question was addressed to me in an online quiz.This intriguing question comes from Alcohols and Phenols topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» RIGHT option is (d) Deprotonation Best explanation: In this STEP, the electron pair of water attack the protonated ALCOHOL, resulting in the loss of H^+ from oxygen (deprotonation) to form an alcohol.

Discussion

69.	What is the common name of the simplest hydroxy derivative of benzene?(a) Phenol(b) Cresol(c) Cyclohexanol(d) GlycerolThis question was posed to me at a job interview.My doubt is from Alcohols, Phenols and Ethers Nomenclature in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The CORRECT choice is (a) Phenol The explanation: The simplest HYDROXY derivative of benzene is phenol, which is its common as well as IUPAC NAME. It is a monohydric compound.

Discussion

70.	What is the common name of Butan-2-ol?(a) n-Butyl alcohol(b) sec-Butyl alcohol(c) Isobutyl alcohol(d) tert-Butyl alcoholI had been asked this question at a job interview.Question is taken from Alcohols, Phenols and Ethers Nomenclature in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct ANSWER is (b) sec-Butyl alcohol To explain I would say: Butan-2-ol has a parent CHAIN of 4 carbon atoms and the OH group at the SECOND carbon. Such configurations have the prefix sec- in the COMMON name.

Discussion

71.	Which of the following terms does not describe CH2=CH-CH2OH?(a) Primary(b) Monohydric(c) Allylic(d) VinylicThis question was posed to me in exam.My question is based upon Alcohols, Phenols and Ethers Classification in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct choice is (d) Vinylic To explain I would SAY: The given compound contains a sp^3 hybridised C-OH bond and is allylic. Ince it has only ONE alkyl group attached to the C bonded to the OH group, it is primary and the presence of only one OH group MAKES it MONOHYDRIC.

Discussion

72.	What is the correct order of reactivity of alcohols toward reactions involving cleavage of C-O bond?(a) 1°>2°>3°(b) 3°>2°>1°(c) 1°>3°>2°(d) 3°>1°>2°The question was asked in quiz.My query is from Alcohols and Phenols topic in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct option is (b) 3°>2°>1° The best explanation: Alkyl groups are electron RELEASING groups and increase the electron density towards OXYGEN making the C-O more polar. This makes the CLEAVAGE of the bond between C and O a lot easier.

Discussion

73.	Which compound reacts with propene to form tripropyl borane?(a) Borane(b) Diborane(c) Boric acid(d) Sodium borohydrideI have been asked this question during an online exam.My question is from Alcohols and Phenols topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right answer is (B) Diborane For explanation I would say: Diborane (B2H6) reacts with alkenes to give trialkyl BORANES as a PRODUCT of successive addition. Firstly, CH3CH2CH2(BH2) is formed which reacts with propene to give (CH3CH2CH2)2BH, which further reacts with propene to finally give (CH3CH2CH2)B, which is tripropyl borane.

Discussion

74.	The compound o-Cresol is named as 2-Hydroxymethyl benzene in the IUPAC system.(a) True(b) FalseThe question was posed to me in an interview for internship.My enquiry is from Alcohols, Phenols and Ethers Nomenclature topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The CORRECT choice is (b) False The explanation: The C attached to the hydroxyl GROUP is considered as the first CARBON and hence the methyl group is present at the second carbon. So the correct name WOULD be 2-Methylphenol.

Discussion

75.	What is the IUPAC name of CH3-O-CH2-CH2-OCH3?(a) 1,2-Dimethoxyethane(b) 1,3-Dimethoxybutane(c) 2,3-Dimethoxyethane(d) 1,4-DimethoxypropaneI had been asked this question in unit test.Enquiry is from Alcohols, Phenols and Ethers Nomenclature topic in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right choice is (a) 1,2-Dimethoxyethane Easiest explanation: The BASE HYDROCARBON is ethane, in which one hydrogen of each CARBON atom is REPLACED by a methoxy group, making it a dimethoxy ether.

Discussion

76.	What is the role of concentrated H2SO4 in the reaction between alcohol and carboxylic acid?(a) Deprotonating agent(b) Dehydrating agent(c) Reducing agent(d) NucleophileI have been asked this question in homework.The origin of the question is Alcohols and Phenols topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct option is (b) DEHYDRATING AGENT Easiest explanation: Concentrated H2SO4 is the catalyst in the esterification of alcohols, which acts a protonating and dehydrating agent. The REACTION is reversible and is SHIFTED in the forward direction by the removal of water as soon as it is formed.

Discussion

77.	Which of the following phenols is not dihydric?(a) p-Cresol(b) Catechol(c) Resorcinol(d) QuinolI had been asked this question in final exam.I'd like to ask this question from Alcohols, Phenols and Ethers Nomenclature in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct option is (a) p-Cresol The explanation is: m-Cresol is a monohydric PHENOL with a methyl GROUP at meta POSITION with respect to OH. Its IUPAC NAME is 3-Methylphenol.

Discussion

78.	When the bond between O and H of the hydroxyl group is broken, alcohols react as _________(a) nucleophiles(b) electrophile(c) protonated molecules(d) electron seeking compoundsThis question was addressed to me during an online exam.I would like to ask this question from Alcohols and Phenols topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct option is (a) NUCLEOPHILES The best I can explain: Alcohols MAY react as nucleophiles or ELECTROPHILES depending upon whether the O-H bond or the C-O bond is broken RESPECTIVELY. CARBOCATIONS are formed in the nucleophile case and protonated alcohols are formed in the electrophile case.

Discussion

79.	What is the catalyst used in the following reaction?(a) Anhydrous AlCl3(b) Anhydrous FeCl3(c) Anhydrous ZnCl2(d) No catalyst requiredThe question was asked during an online exam.This is a very interesting question from Alcohols and Phenols in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right ANSWER is (d) No catalyst required The explanation: The given alcohol is a TERTIARY alcohol and can easily form alkyl halides with HCL and does not require any catalyst. HOWEVER, PRIMARY and secondary alcohols require ZnCl2 as catalyst in the same reaction for it to proceed.

Discussion

80.	Which of the following phenols is the most acidic?(a) o-Cresol(b) m-Cresol(c) o-Nitrophenol(d) m-NitrophenolThis question was posed to me in an interview.My enquiry is from Alcohols and Phenols topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right choice is (c) o-Nitrophenol To elaborate: Alkyl GROUPS are electron RELEASING, and contribute towards a reduction in acidic strength of phenols. Electron WITHDRAWING groups like nitro, enhances the acidic strength especially at ortho and para positions, DUE to effective delocalisation of negative charge in the PHENOXIDE ion.

Discussion

81.	Which of the following compounds is the best proton acceptor?(a) Ethanol(b) Phenol(c) p-Cresol(d) p-NitrophenolThis question was posed to me in final exam.This key question is from Alcohols and Phenols topic in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right choice is (a) Ethanol To explain: Proton acceptor indicates the BASIC nature of the compound. Ethanol is the only alcohol in the given compounds, and it is the least acidic, because phenols are more acidic than alcohols DUE to their STABILITY through RESONANCE STRUCTURES.

Discussion

82.	Toluene and phenol have similar boiling points.(a) True(b) FalseThe question was asked in an international level competition.I need to ask this question from Alcohols and Phenols topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct choice is (B) False The explanation: Phenols have MUCH higher boiling points than aromatic compounds of similar molecular mass. This is because they exist as ASSOCIATED MOLECULES due to intermolecular hydrogen bonding.

Discussion

83.	Identify the nucleophile that attacks the carbocation in the second step of acid catalysed hydration of alkenes?(a) OH^–(b) H2O(c) H^+(d) H3O^+I got this question by my school teacher while I was bunking the class.My doubt is from Alcohols and Phenols topic in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» CORRECT option is (B) H2O To elaborate: Nucleophiles are electron RICH species that attack the part of the structure that is electron deficient. In this step, the H2O nucleophile attacks the carbocation FORMING a protonated alcohol.

Discussion

84.	The C-O-C bond angle in ethers is _______(a) lesser than 109.5°(b) 109.5°(c) greater than 109.5°(d) 180°This question was addressed to me by my school principal while I was bunking the class.My question is taken from Structures of Functional Groups in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct answer is (c) greater than 109.5° To ELABORATE: Due to the repulsive interaction of the bulky alkyl/aryl groups in ETHERS, the bond ANGLE is slightly more than the tetrahedral angle, i.e., 109.5°. For example, the C-O-C bond angle in METHOXYMETHANE is 111.7°.

Discussion

85.	How many lone pairs of electrons does O atom have in methanol?(a) 0(b) 1(c) 2(d) 4I had been asked this question at a job interview.The above asked question is from Structures of Functional Groups topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct answer is (c) 2 The explanation: The oxygen atom in METHANOL is sp^3 hybridised. One of the sp^3 orbitals overlaps with 1S ORBITAL of hydrogen (of OH group) and one sp^3 orbital overlaps with sp^3 orbital of C atom. The remaining two sp^3 orbitals CONTAIN one lone pair of electrons each.

Discussion

86.	Phenols are not soluble in which of the following?(a) Water(b) Alcohol(c) Ether(d) Sodium hydroxideThe question was asked during a job interview.My query is from Alcohols and Phenols in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» CORRECT answer is (a) Water Easiest EXPLANATION: Phenols are ALMOST insoluble in water because of the PRESENCE of a very large non-polar aryl group which overcomes the polar character of the OH group.

Discussion

87.	Which of the following aldehydes can produce 1o alcohols when treated with Grignard reagent?(a) Methanal(b) Ethanal(c) Propanal(d) ButanalI had been asked this question by my school principal while I was bunking the class.This is a very interesting question from Alcohols and Phenols topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» RIGHT choice is (a) Methanal The best I can explain: Methanal on TREATMENT with Grignard reagent forms an adduct which has only one alkyl group attached to the C atom along with TWO hydrogens and one O-Mg-X (X=halogen) group. This on hydrolysis will form a primary alcohol where the OH group will replace the O-Mg-X group.

Discussion

88.	How many carbon atoms are present in the parent chain of tert-Butyl alcohol?(a) 2(b) 3(c) 4(d) 5I got this question in class test.My query is from Alcohols, Phenols and Ethers Nomenclature in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct option is (b) 3 The explanation: The IUPAC NAME of tert-Butyl alcohol is 2-methylpropan-2-ol, which has TWO SUBSTITUENT groups at the C-2 position, namely one methyl and one HYDROXYL GROUP.

Discussion

89.	In methanol, the O-H bond length is smaller than the C-O bond length.(a) True(b) FalseThis question was addressed to me in an internship interview.The question is from Structures of Functional Groups topic in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right ANSWER is (a) True To elaborate: Since HYDROGEN atom is smaller than the carbon atom and has only 1S orbital, the O-H BOND (96pm) is much smaller than the C-O bond (142pm).

Discussion

90.	Phenetole is an aromatic ether.(a) True(b) FalseThe question was asked in class test.This key question is from Alcohols, Phenols and Ethers Nomenclature in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct choice is (a) True To EXPLAIN: PHENETOLE is also known as ETHOXYBENZENE or ethyl phenyl ether and has an aromatic RING on one side.

Discussion

91.	Which of the following is not an aromatic ether?(a) CH3-O-C6H5(b) CH3-O-CH2CH3(c) C2H5-O-C6H5(d) C6H5-O-C6H5The question was posed to me in an interview.The query is from Alcohols, Phenols and Ethers Classification in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» RIGHT ANSWER is (b) CH3-O-CH2CH3 The explanation is: Aromatic ethers are those in which at least ONE of the groups on either side of O atom is an aryl group. In CH3-O-CH2CH3, both the groups are ALKYL and is hence an aliphatic ether.

Discussion

92.	What is the correct common name for CH3OC2H5?(a) Methyl methyl ether(b) Methyl ethyl ether(c) Ethyl ethyl ether(d) Ethyl methyl etherThe question was posed to me in an interview for internship.I want to ask this question from Alcohols, Phenols and Ethers Nomenclature in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct choice is (d) Ethyl methyl ether The EXPLANATION is: It is an unsymmetrical ether with ONE methyl group and one ethyl group. It is NAMED such that the alkyl group are in ALPHABETICAL order.

Discussion

93.	When the alkyl groups attached to either side of the oxygen atom of an ether id different, it is known as _______ ether.(a) simple(b) symmetrical(c) mixed(d) diethylThe question was asked in exam.The question is from Alcohols, Phenols and Ethers Classification in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct choice is (c) mixed Explanation: If the ALKYL or aryl groups on EITHER side of O atom is different, it is known as a mixed or unsymmetrical ETHER.

Discussion

94.	Phenol can be obtained by ________ of sodium phenoxide.(a) acidification(b) oxidation(c) sulphonation(d) hydrolysisI had been asked this question at a job interview.The query is from Alcohols and Phenols topic in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The CORRECT OPTION is (a) acidification The best I can explain: When halobenzene is fused with NaOH at 623K and 320atm with a copper salt as catalyst, sodium phenoxide is produced which on treatment with dilute HCl yields PHENOL. This is also known as Dow’s PROCESS.

Discussion

95.	Which of the following process do not yield alcohols?(a) Acid catalysed hydration of alkenes(b) Hydroboration-oxidation of alkenes(c) Reduction of aldehydes(d) Free radical halogenation of alkanesI have been asked this question during a job interview.The doubt is from Alcohols and Phenols topic in section Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Right ANSWER is (d) Free RADICAL halogenation of alkanes The explanation is: Alkanes on free radical halogenation produce a mixture of haloalkanes and not alcohols. Alcohols can be PREPARED from ALKENES by ACID catalysed hydration and hydroboration-oxidation or from reduction of aldehydes.

Discussion

96.	Diethyl ether is a mixed ether.(a) True(b) FalseI got this question in unit test.The doubt is from Alcohols, Phenols and Ethers Classification in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct option is (B) False To EXPLAIN: Diethyl ether consists of ethyl (C2H5) groups on either side of O, hence it is a simple symmetrical ether.

Discussion

97.	What is the value of C-O-H bond angle in phenol?(a) 108°(b) 108.9°(c) 109°(d) 109.8°I have been asked this question in an online interview.Question is taken from Structures of Functional Groups in portion Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct option is (c) 109° Easiest EXPLANATION: The bond ANGLE C-O-H in phenols is 109° which is slightly more than the C-O-H bond angle in METHANOL (108.9°) and slightly less than the tetrahedral bond angle (109.5°).

Discussion

98.	Hydrolysis of the adduct formed form the reaction of ________ with methyl magnesium bromide gives 2-Methylpropan-2-ol.(a) Methanal(b) Ethanal(c) Propanal(d) PropanoneI have been asked this question by my college professor while I was bunking the class.My question comes from Alcohols and Phenols topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The correct answer is (d) Propanone The explanation is: 2-Methylpropan-2-ol is a tertiary alcohol which is PRODUCED from the hydrolysis of the adduct FORMED between a ketone and a GRIGNARD REAGENT.

Discussion

99.	Esters on catalytic hydrogenation always give a mixture of two different alcohols.(a) True(b) FalseThis question was posed to me in my homework.Enquiry is from Alcohols and Phenols in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» The CORRECT choice is (b) False Explanation: Esters (RCOOR’) give a MIXTURE of two alcohols depending UPON the acyl group (RCO^–) and the alkoxy group (-OR’). Methyl ACETATE (CH3COOCH3) gives a mixture of methanol and ethanol, whereas ethyl acetate (CH3COOCH2CH3) gives only ethanol.

Discussion

100.	What is the IUPAC name of CH3(CH2)6-OC6H5?(a) Heptyl phenyl ether(b) 1-Phenoxyheptane(c) 1-Hepoxybenzene(d) Phenyl heptyl etherI got this question by my school principal while I was bunking the class.This is a very interesting question from Alcohols, Phenols and Ethers Nomenclature topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12
Answer» Correct answer is (B) 1-Phenoxyheptane Best explanation: Since heptane is a LARGER GROUP than benzene, it is chosen as the PARENT hydrocarbon and the COMPOUND is named as an aryloxy derivative of heptane.

Discussion

Explore topic-wise InterviewSolutions in .

If A and B are the C-O bond lengths in methanol and phenol respectively, what is the relationship between A and B?(a) A>B(b) A

Glycerol is a _________ alcohol.(a) monohydric(b) dihydric(c) trihydric(d) tetrahydricThe question was posed to me in exam.My enquiry is from Alcohols, Phenols and Ethers Nomenclature topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12

Propan-2-ol can be prepared form the hydroboration-oxidation of propene.(a) True(b) FalseThe question was asked during a job interview.My enquiry is from Alcohols and Phenols topic in section Alcohols, Phenols and Ethers of Chemistry – Class 12

Identify the catalyst in the hydration of alkenes to produce alcohols.(a) HCl(b) FeCl3(c) Pt(d) NiI have been asked this question during an internship interview.Origin of the question is Alcohols and Phenols in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12

What is the IUPAC name of Isopropyl alcohol?(a) Propan-1-ol(b) Propan-2-ol(c) 2-Methylpropan-1-ol(d) 2-Methylpropan-2-olThe question was asked in a job interview.Asked question is from Alcohols, Phenols and Ethers Nomenclature in portion Alcohols, Phenols and Ethers of Chemistry – Class 12

What is formed when phenol is reacted with bromine water?(a) White precipitate(b) Colourless gas(c) Brown liquid(d) No reactionI got this question during an interview for a job.Question is taken from Alcohols and Phenols topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12

Which of the following compounds is ethoxyethane?(a) CH3OCH3(b) CH3OC2H5(c) C2H5OC2H5(d) C2H5OC3H7The question was posed to me in an interview for internship.Question is from Alcohols, Phenols and Ethers Nomenclature topic in portion Alcohols, Phenols and Ethers of Chemistry – Class 12

Ortho and para isomers of nitrophenol can be separated by ________ distillation.(a) fractional(b) steam(c) vacuum(d) zoneThe question was posed to me during an interview.My doubt is from Alcohols and Phenols in section Alcohols, Phenols and Ethers of Chemistry – Class 12

According to IUPAC, what is the suffix used for naming alcohols?(a) -al(b) -ol(c) -one(d) -OHI have been asked this question in a job interview.I want to ask this question from Alcohols, Phenols and Ethers Nomenclature in section Alcohols, Phenols and Ethers of Chemistry – Class 12

What is the general formula for an aliphatic alcohol? (R=alkyl group)(a) R-H(b) R-OH(c) R-CHO(d) R-COOHThe question was posed to me in exam.Enquiry is from Alcohols, Phenols and Ethers Classification in section Alcohols, Phenols and Ethers of Chemistry – Class 12

Identify the simple ether from the following.(a) CH3OC2H5(b) C2H5OC6H5(c) C6H5OCH3(d) C6H5OC6H5I have been asked this question in an interview for job.The question is from Alcohols, Phenols and Ethers Classification topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12

What is the correct relation between acidic strength of primary, secondary and tertiary alcohols?(a) 1°>2°>3°(b) 1°2°The question was asked during a job interview.This key question is from Alcohols and Phenols in portion Alcohols, Phenols and Ethers of Chemistry – Class 12

Propan-1-ol boils at a higher temperature than propan-2-ol.(a) True(b) FalseThe question was asked in examination.This is a very interesting question from Alcohols and Phenols in division Alcohols, Phenols and Ethers of Chemistry – Class 12

What is the common name of the simplest hydroxy derivative of benzene?(a) Phenol(b) Cresol(c) Cyclohexanol(d) GlycerolThis question was posed to me at a job interview.My doubt is from Alcohols, Phenols and Ethers Nomenclature in section Alcohols, Phenols and Ethers of Chemistry – Class 12

Which of the following terms does not describe CH2=CH-CH2OH?(a) Primary(b) Monohydric(c) Allylic(d) VinylicThis question was posed to me in exam.My question is based upon Alcohols, Phenols and Ethers Classification in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12

Which compound reacts with propene to form tripropyl borane?(a) Borane(b) Diborane(c) Boric acid(d) Sodium borohydrideI have been asked this question during an online exam.My question is from Alcohols and Phenols topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12

The compound o-Cresol is named as 2-Hydroxymethyl benzene in the IUPAC system.(a) True(b) FalseThe question was posed to me in an interview for internship.My enquiry is from Alcohols, Phenols and Ethers Nomenclature topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12

Which of the following phenols is not dihydric?(a) p-Cresol(b) Catechol(c) Resorcinol(d) QuinolI had been asked this question in final exam.I'd like to ask this question from Alcohols, Phenols and Ethers Nomenclature in section Alcohols, Phenols and Ethers of Chemistry – Class 12

Which of the following phenols is the most acidic?(a) o-Cresol(b) m-Cresol(c) o-Nitrophenol(d) m-NitrophenolThis question was posed to me in an interview.My enquiry is from Alcohols and Phenols topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12

Which of the following compounds is the best proton acceptor?(a) Ethanol(b) Phenol(c) p-Cresol(d) p-NitrophenolThis question was posed to me in final exam.This key question is from Alcohols and Phenols topic in section Alcohols, Phenols and Ethers of Chemistry – Class 12

Toluene and phenol have similar boiling points.(a) True(b) FalseThe question was asked in an international level competition.I need to ask this question from Alcohols and Phenols topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12

How many lone pairs of electrons does O atom have in methanol?(a) 0(b) 1(c) 2(d) 4I had been asked this question at a job interview.The above asked question is from Structures of Functional Groups topic in division Alcohols, Phenols and Ethers of Chemistry – Class 12

Phenols are not soluble in which of the following?(a) Water(b) Alcohol(c) Ether(d) Sodium hydroxideThe question was asked during a job interview.My query is from Alcohols and Phenols in portion Alcohols, Phenols and Ethers of Chemistry – Class 12

How many carbon atoms are present in the parent chain of tert-Butyl alcohol?(a) 2(b) 3(c) 4(d) 5I got this question in class test.My query is from Alcohols, Phenols and Ethers Nomenclature in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12

In methanol, the O-H bond length is smaller than the C-O bond length.(a) True(b) FalseThis question was addressed to me in an internship interview.The question is from Structures of Functional Groups topic in section Alcohols, Phenols and Ethers of Chemistry – Class 12

Phenetole is an aromatic ether.(a) True(b) FalseThe question was asked in class test.This key question is from Alcohols, Phenols and Ethers Nomenclature in division Alcohols, Phenols and Ethers of Chemistry – Class 12

Which of the following is not an aromatic ether?(a) CH3-O-C6H5(b) CH3-O-CH2CH3(c) C2H5-O-C6H5(d) C6H5-O-C6H5The question was posed to me in an interview.The query is from Alcohols, Phenols and Ethers Classification in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12

Phenol can be obtained by ________ of sodium phenoxide.(a) acidification(b) oxidation(c) sulphonation(d) hydrolysisI had been asked this question at a job interview.The query is from Alcohols and Phenols topic in portion Alcohols, Phenols and Ethers of Chemistry – Class 12

Diethyl ether is a mixed ether.(a) True(b) FalseI got this question in unit test.The doubt is from Alcohols, Phenols and Ethers Classification in division Alcohols, Phenols and Ethers of Chemistry – Class 12

What is the value of C-O-H bond angle in phenol?(a) 108°(b) 108.9°(c) 109°(d) 109.8°I have been asked this question in an online interview.Question is taken from Structures of Functional Groups in portion Alcohols, Phenols and Ethers of Chemistry – Class 12

Esters on catalytic hydrogenation always give a mixture of two different alcohols.(a) True(b) FalseThis question was posed to me in my homework.Enquiry is from Alcohols and Phenols in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12