970 + Interview Questions in ALCOHOLS IN GENERAL AWARENESS Page 19 InterviewSolution

901.	The compound that will react most readily with `NaOH` to from methanol isA. `(CH_(3))_(4)overset(+)(N)I^(-)`B. `CH_(3)-O-CH_(3)`C. `(CH_(3))_(3)overset(+)(S)I^(-)`D. `(CH_(3))_(3)C-Cl`
Answer» Correct Answer - A

Discussion

902.	Methanol is obtained by reduction ofA. `CH_3-CHO`B. `CH_3-COOH `C. `H-CONH_2 `D. H-COOH
Answer» Correct Answer - D

Discussion

903.	Product of the following reaction is A. B. C. D.
Answer» Correct Answer - A

Discussion

904.	Ethyl phenyl ether is reacted with cold conc. HBr givesA. phenol and ethaneB. bromobenzene and ethaneC. bromobenzene and bromoethaneD. phenol and bromoethane
Answer» Correct Answer - D

Discussion

905.	`-CH_2OH` group is obtained by reduction ofA. R-CNB. `R-NO_2`C. R-CO-RD. R-COOH
Answer» Correct Answer - D

Discussion

906.	Cyclohexane carbaldehyde is reacted with ethyl magnesium halide in the presence of dry ether and product on acid hydrolysis givesA. B. C. D.
Answer» Correct Answer - C

Discussion

907.	Product of the following reaction. A. B. C. D.
Answer» Correct Answer - C

Discussion

908.	Product of the following reaction is A. B. C. D.
Answer» Correct Answer - D

Discussion

909.	3-methyl but-1-ene on HBO reaction givesA. 3-methyl butan-2-olB. 2-methyl butan-2-olC. 3-methyl butan-1-olD. 2-methyl butan-1-ol
Answer» Correct Answer - C

Discussion

910.	A changes to ___ with hydroboration -oxidation `A:CH_3CH=overset(CH_3)overset\|C CH_3`A. `CH_3undersetunderset(OH)\|CH undersetunderset(CH_3)\|CHCH_3`B. `CH_3CH_2undersetunderset(CH_3)\|oversetoverset(CH_3)\|C CH_3`C. `CH_3CH_2undersetunderset(CH_3)\|CHCH_2OH`D. none of these
Answer» Correct Answer - A

Discussion

911.	Hydroboration oxidation of 3-methyl but-1-ene givesA. 3-methylbutan-2-olB. 2-methylbutan-2-olC. 3-methylbutan-1-olD. 2-methylbutan-1-ol
Answer» Correct Answer - C

Discussion

912.	Styrene on hydroboration oxidation givesA. 2-phenyl ethan-1-olB. 1-phenyl ethan-1-olC. benzoic acidD. benzaldehyde
Answer» Correct Answer - A

Discussion

913.	Which rule is obeyed by hydroboration oxidation process?
Answer» The rule obeyed by hydroboration oxidation process is opposite to the Markovnikov's rule.

Discussion

914.	Hydroboration oxidation of propene producesA. B. C. D.
Answer» Correct Answer - A

Discussion

915.	You are given benzene, conc. `H_(2)SO_(4)`, and NaOH. Write the equations for the preparation of phenol usign these regents.
Answer» `underset("Benzene")(C_(6)H_(6))overset(conc.H_(2)SO_(4).Delta)underset("Sulphonation")rarr underset("sulphonic acid")underset("Benzone")(C_(6)H_(5)SO_(3)H)overset(NaOH."fuse")underset(573K)rarrunderset("phenoxide")underset("Sodium")(C_(6)H_(5)ONa)overset("Dil HCl")underset(-NaCl)rarr underset("Phenol")(C_(6)H_(5)OH)`

Discussion

916.	Find out (B) in the following reaction `C_3H_8+Br_2 overset(AlBr_3)to (A) overset(Aq. KOH)to (B)`A. `CH_3-CH=CH_2`B. `CH_3-CH_2-CH_2-OH`C. `CH_3-CHOH-CH_3`D. `CH_3-O-C_2H_5`
Answer» Correct Answer - C

Discussion

917.	Phenol reacts with `Br_2` in `C Cl_4` at low temperature to giveA. o- and p- bromophenolB. m-bromophenolC. p-bromophenolD. 2, 4, 6-tribromophenol
Answer» Correct Answer - A

Discussion

918.	Which of the following reagents would distinguish ciscyclopenta `-1,2-`diol from the trans-isomer?A. AcetoneB. `MnO_(2)`C. ozoneD. Aluminium isopropoxide
Answer» Correct Answer - A

Discussion

919.	Ethyl alcohol is manufactured from ethylene byA. PermanganateB. Catalytic oxidationC. Absorption into Conc. `H_(2)SO_(4)` followed by hydrolysisD. Reduction
Answer» Correct Answer - C

Discussion

920.	This change can be carried out by using A. reductionB. nascent oxygenC. air oxidationD. hydrolysis
Answer» Correct Answer - C

Discussion

921.	A can beA. `SiO_2`B. `SiO_2` / steamC. steamD. aq. KOH
Answer» Correct Answer - B

Discussion

922.	2-propylbenzene on air oxidation and followed by decomposition by dilute acid givesA. phenol and propanalB. phenol and propanoneC. phenol and propanolD. phenol and propionic acid
Answer» Correct Answer - B

Discussion

923.	The reaction Ph-OH + dilute `HNO_3 to ` ? Gives predominatelyA. 2-nitrocarbolicacidB. 4-nitrocarbolicacidC. 2,4,6- trinitrocarbolic acidD. 3-nitro carbolic acid
Answer» Correct Answer - A

Discussion

924.	What is the general formula of ethers?
Answer» The general formula of ethers is C_nH_2n+2O. For example, Dimethyl ether CH₃ – O – CH₃ has molecular formula C₂H₆O.

924.

What is the general formula of ethers?

Answer»

The general formula of ethers is C_nH_2n+2O.

For example,

Dimethyl ether CH₃ – O – CH₃ has molecular formula C₂H₆O.

Discussion

925.	What are ethers? How are ethers classified?
Answer» They are alkoxy derivatives of alkanes in which a hydrogen atom of alkane (R – H) is replaced by alkoxy group ( – O – R) and divalent oxygen atom is attached to two alkyl groups or two aryl groups or one alkyl and one aryl group. Ethers are organic oxides R – O – Ar, Ar – O – Ar. E.g. R – O – R or C₂H₅ – O – C₂H₅. Ethers are classified into two groups as follows : (1) Simple or symmetrical ether : The ethers in which both alkyl (or aryl) groups attached to the oxygen atom are same are called simple ethers. E.g. (R – O – R), CH₃– O – CH₃, dimethyl ether; C₆H5 – O - C₆H₅ diphenyl ether. (2) Mixed or unsymmetrical ethers : The ethers in which the two alkyl (or aryl) groups attached to the oxygen atom are different are called mixed ethers. E.g. (R – O – R), CH₃ – O – C₂H₅ ethyl methyl ether; C₂H₅ – O – C₆H₅ ethyl phenyl ether.

925.

What are ethers? How are ethers classified?

Answer»

They are alkoxy derivatives of alkanes in which a hydrogen atom of alkane (R – H) is replaced by alkoxy group ( – O – R) and divalent oxygen atom is attached to two alkyl groups or two aryl groups or one alkyl and one aryl group.

Ethers are organic oxides R – O – Ar, Ar – O – Ar.

E.g. R – O – R or C₂H₅ – O – C₂H₅.

Ethers are classified into two groups as follows :

(1) Simple or symmetrical ether :

The ethers in which both alkyl (or aryl) groups attached to the oxygen atom are same are called simple ethers.

E.g. (R – O – R), CH₃– O – CH₃, dimethyl ether; C₆H5 – O - C₆H₅ diphenyl ether.

(2) Mixed or unsymmetrical ethers :

The ethers in which the two alkyl (or aryl) groups attached to the oxygen atom are different are called mixed ethers.

E.g. (R – O – R), CH₃ – O – C₂H₅ ethyl methyl ether; C₂H₅ – O – C₆H₅ ethyl phenyl ether.

Discussion

926.	Explain laboratory test of alcohols and phenols.
Answer» Laboratory test : Aqueous solution of alcohols and phenols can be tested with litmus paper. Aqueous solution of alcohols is neutral to litmus (neither blue nor red litmus change colour). Aqueous solutions of phenols turn blue litmus red. Thus, Phenols have acidic character.

926.

Explain laboratory test of alcohols and phenols.

Answer»

Laboratory test : Aqueous solution of alcohols and phenols can be tested with litmus paper. Aqueous solution of alcohols is neutral to litmus (neither blue nor red litmus change colour).

Aqueous solutions of phenols turn blue litmus red.

Thus,

Phenols have acidic character.

Discussion

927.	Which fo the following compounds is obtained when glycerol is heated with oxalic acid at 503K ?A. Formic acidB. Allyl alcoholC. Carbon dioxideD. Glycerol dioxalate
Answer» Correct Answer - B

Discussion

928.	Anisole with conc. `HNO_(3)` and conc. `H_(2)SO_(4)` givesA. PhenolB. NitrobenzeneC. O - and - P - NitroanisoleD. O- Nitroanisole
Answer» Correct Answer - C

Discussion

929.	Which one is formed when sodium phenoxide is heated with ethyl iodide?A. PhenetoleB. Ethyl phenyl alcoholC. PhenoneD. None of these
Answer» Correct Answer - A

Discussion

930.	One mole of aniline warmed with the mixture of `NaNO_(2)+HCl`. If we assume 100% yield, volume of `N_(2)` gas liberated at S.T.P isA. `11.2 L`B. `22.4 L`C. `33.6 L`D. `44.8 L`
Answer» Correct Answer - B

Discussion

931.	Sodium phenoxide when heated with `CO_(2)` under pressure at `125^(@) C` yield a product which on acetylation gives product `C` A. salolB. salicyladehydeC. sodium benzoateD. sodium salicylate
Answer» Correct Answer - D

Discussion

932.	Which one of the following will be most recctive for `S_(N1` reaction?A. B. `C_(6)H_(5)-overset(OH)overset(\|)(CH)-CH_(6)H_(5)`C. `CH_(3)-underset(CH_(3))underset(\|)overset(OH)overset(\|)C-CH_(3)`D.
Answer» Correct Answer - D According to carbocation stability

Discussion

933.	The enzyme that converts cane sugar into invert sugar (a mixture of glucose and fructose) isA. DiastaseB. InvertaseC. ZymaseD. Maltase
Answer» Correct Answer - C `underset("Glucose of Fructose")(C_(6)H_(12)O_(6))overset("Zymase")rarrunderset("Ethylalcohol")(2C_(2)H_(5)OH)+2CO_(2)`

Discussion

934.	Give the structures and IUPAC names of the products expected from the following reactions: (a) Catalytic reduction of butanal. (b) Hydration of propene in the presence of dilute sulphuric acid. (c) Reaction of propanone with methylmagnesium bromide followed by hydrolysis.
Answer» (a) `underset("Butan-1-ol")(CH_(3)-CH_(2)-CH_(2)-CH_(2)-OH)` (b) `underset("Propan-2-ol")(CH_(3)-underset(OH)underset("\| ")(C )H-CH_(3))` (c ) `underset("2-Methylpropan-2-ol")(CH_(3)-overset(CH_(3))overset("\| ")underset(CH_(3))underset("\| ")(C )-OH)`

Discussion

935.	Arrange the following compounds in increasing order of boiling point : Propan-1-ol, butan-1-ol, butan-2-ol, pentan-1-olA. Propan-1-ol `lt` butan-2-l `lt` butan-1-pl `lt` pentan-1-olB. Propan-1-ol `lt` butan-1-ol `lt` butan-2-ol `lt` pentan-1-olC. Pentan-1-ol `lt` butan-2-ol `lt` butan-1-ol `lt` propan-1-olD. Pentan-1-ol `lt` butan-1-ol `lt` butan-2-ol `lt` propan-1-ol
Answer» Correct Answer - A With the increase in molecular mass, the boiling points also increase. Amongest isomeric alcohols, the boiling point decreases with branching due to decrease in surface area.

Discussion

936.	Arrange the following sets of compounds in order of their increasing boiling points: (a) Pentan-1-ol, butan-1-ol, butan-2-ol, ethanol, propan-1-ol, methanol. (b) Pentan-1-ol, n-butane, pentanal, ethoxyethane.
Answer» (a) Methanol, ethanol, propan-1-ol, butan-2-ol, butan-1-ol, pentan-1-ol. (b) n-Butane, ethoxyethane, pentanal and pentan-1-ol.

Discussion

937.	Which of the following is not characteristic of alcohols?A. Lower alcohols are stronger and have bitter tasteB. Higher alcohols are stronger and have bitter tasteC. The boiling points of alcohols increase with increasing molecular massD. The lower alcohol are soluble in water
Answer» Correct Answer - B

Discussion

938.	Which one is not characteristic of alcohols ?A. They are lighter than waterB. Their B.P. rise uniformly with increasing molecular massC. Lower members are insoluble in water but solubility increases regularlyD. Lower members have pleasent odour and burning test
Answer» Correct Answer - C

Discussion

939.	Which of the following is not characteristic of alcohols?A. They are lighter than waterB. Their boiling points rise fairly uniformly with increasing molecular weightC. Lower members have pleasant small and burning taste, while higher members are odourless and testelessD. Lower mombers are in water organic solvents but solubility regularly increases with molecular weight
Answer» Correct Answer - D Lower members are soluble in water and solubility decrease with increasing molecular mass because hydrophobic character increases.

Discussion

940.	Which of the following is not characteristic of alcohols?A. Lower alcohols are stronger and have bitter tasteB. Higher alcohols are stronger and have bitter tasteC. The boiling points of alcohols increases with increasing molecular massD. The lower alcohols are soluble in water
Answer» Correct Answer - B Higher alcohols are stronger and have bitter taste.

Discussion

941.	Arrange the following compounds in increasing order of boiling point : Prpane-1-ol, butan-1-ol, butan-2-ol, pentan-1-olA. Propan-1-ol,butan-2-ol, butan-1-ol,pentan-1-olB. Propan-1-ol,butan-1-ol, butan-2-ol,pentan-olC. pentan-1-,butan-2-ol,butan-1-ol,propan-1-olD. pentan-1-l,butan-1-ol, butan-2-,ol, propan-1-ol
Answer» Correct Answer - A

Discussion

942.	Assertion (A) o-nitrophenol is less soluble in water than the m and p-isomers. Reason (R) m and p-nitrophenols exist as associated molecules.A. Assertion and reason both are correct and reason is correct explanation of assertion.B. Assertion and reason both are wrong statements.C. Assertion is correct statement but reason is wrong statement.D. Assertion is wrong statement but reason is correct statement.
Answer» Correct Answer - D Both assertion and reason are correct statements but reason is not correct explanation of assertion. Correct Explanation Due to the presence of intramolecular hydrogen bonding, o-nitrophenol does not form hydrogen bonds with `H_(2)O` but m and p-nitrophenol form hydrogen bonds with water.

Discussion

943.	Which of the following is not characteristic of alcohols?A. They are lighter than water .B. Their boiling points rise fairly uniformly with rising molecular weight .C. Lower members are insoluble in water and organic solvents but the solubility regularly increases with molecular mass .D. Lower members have a pleasant smell and burning taste , higher members are colourless and tasteless .
Answer» Correct Answer - C

Discussion

944.	Unlike phenol , 2,4-dinitrophenol is soluble in sodium carbonate solution in water becauseA. presence of two- `NO_(2)` groups in the ring makes 2,4- dinitrophenol a stronger acid than phenolB. presence of two - `NO_(2)` groups in the ring makes 2,4-dinitrophenol a weaker acid than phenolC. presence of two - `NO_(2)` groups make the hydrogen bonding easier , making 2,4-dinitrophenol solubleD. nitro group reacts with `Na_(2)CO_(3)` while `-OH` group does not .
Answer» Correct Answer - A

Discussion

945.	Ortho -nitrophenol is less soluble in water than `p`-and `m-`nitrophenols becauseA. o-nitrophenol shows intramolecular H-bondingB. o-nitrophenol shows intermolecular H-bondingC. melting point of o-nitrophenol is lower than those of m- and p-isomersD. o-nitrophenol is more volatile in steam than those of m-and p-isomers .
Answer» Correct Answer - A

Discussion

946.	The structure of the product (P ) of the following reaction is `:` A. B. C. D.
Answer» Correct Answer - D

Discussion

947.	The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is :A. Benzoic acidB. salicylic acidC. salicylaldehydeD. phthalic acid
Answer» Correct Answer - B

Discussion

948.	When sodium benzene sulphonate is fused with sodium hydroxide (solide), the product formed is `:`A. benzeneB. phenolC. benzene triphenolD. none of these
Answer» Correct Answer - B

Discussion

949.	Assertion: `m-`Methoxyphenol is a stronger acid than `p`-methoxyphenol. Reason: Methoxy group exerts `+R`-effect at both `o`-and `p-`positions.A. If both assertion and reason are true and the reason is the correct explanantion of the assertion.B. If both assertion and reason are true but reason is not the correct explanantion of the asseriton.C. If assertion is true but reason is false.D. If assertion if false but reason is ture.
Answer» Correct Answer - B Correct explanation. Methoxy group exerts `-1`- effect at `m`-position and `+R`-effect at `p-`position, thereby making `m-`meyhoxyphenol a stronger acid than `p`-methoxyphenol.

Discussion

950.	Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.
Answer» The formation of ethers by dehydration of alcohol is a bimolecular reaction (S_N2) involving the attack of an alcohol molecule on a protonated alcohol molecule. In the method, the alkyl group should be unhindered. In case of secondary or tertiary alcohols, the alkyl group is hindered. As a result, elimination dominates over substitution. Hence, in place of ethers, alkenes are formed.

Discussion

Explore topic-wise InterviewSolutions in .

The compound that will react most readily with `NaOH` to from methanol isA. `(CH_(3))_(4)overset(+)(N)I^(-)`B. `CH_(3)-O-CH_(3)`C. `(CH_(3))_(3)overset(+)(S)I^(-)`D. `(CH_(3))_(3)C-Cl`

Methanol is obtained by reduction ofA. `CH_3-CHO`B. `CH_3-COOH `C. `H-CONH_2 `D. H-COOH

Product of the following reaction is A. B. C. D.

Ethyl phenyl ether is reacted with cold conc. HBr givesA. phenol and ethaneB. bromobenzene and ethaneC. bromobenzene and bromoethaneD. phenol and bromoethane

`-CH_2OH` group is obtained by reduction ofA. R-CNB. `R-NO_2`C. R-CO-RD. R-COOH

Cyclohexane carbaldehyde is reacted with ethyl magnesium halide in the presence of dry ether and product on acid hydrolysis givesA. B. C. D.

Product of the following reaction. A. B. C. D.

Product of the following reaction is A. B. C. D.

3-methyl but-1-ene on HBO reaction givesA. 3-methyl butan-2-olB. 2-methyl butan-2-olC. 3-methyl butan-1-olD. 2-methyl butan-1-ol

A changes to ___ with hydroboration -oxidation `A:CH_3CH=overset(CH_3)overset|C CH_3`A. `CH_3undersetunderset(OH)|CH undersetunderset(CH_3)|CHCH_3`B. `CH_3CH_2undersetunderset(CH_3)|oversetoverset(CH_3)|C CH_3`C. `CH_3CH_2undersetunderset(CH_3)|CHCH_2OH`D. none of these

Hydroboration oxidation of 3-methyl but-1-ene givesA. 3-methylbutan-2-olB. 2-methylbutan-2-olC. 3-methylbutan-1-olD. 2-methylbutan-1-ol

Styrene on hydroboration oxidation givesA. 2-phenyl ethan-1-olB. 1-phenyl ethan-1-olC. benzoic acidD. benzaldehyde

Which rule is obeyed by hydroboration oxidation process?

Hydroboration oxidation of propene producesA. B. C. D.

You are given benzene, conc. `H_(2)SO_(4)`, and NaOH. Write the equations for the preparation of phenol usign these regents.

Find out (B) in the following reaction `C_3H_8+Br_2 overset(AlBr_3)to (A) overset(Aq. KOH)to (B)`A. `CH_3-CH=CH_2`B. `CH_3-CH_2-CH_2-OH`C. `CH_3-CHOH-CH_3`D. `CH_3-O-C_2H_5`

Phenol reacts with `Br_2` in `C Cl_4` at low temperature to giveA. o- and p- bromophenolB. m-bromophenolC. p-bromophenolD. 2, 4, 6-tribromophenol

Which of the following reagents would distinguish ciscyclopenta `-1,2-`diol from the trans-isomer?A. AcetoneB. `MnO_(2)`C. ozoneD. Aluminium isopropoxide

Ethyl alcohol is manufactured from ethylene byA. PermanganateB. Catalytic oxidationC. Absorption into Conc. `H_(2)SO_(4)` followed by hydrolysisD. Reduction

This change can be carried out by using A. reductionB. nascent oxygenC. air oxidationD. hydrolysis

A can beA. `SiO_2`B. `SiO_2` / steamC. steamD. aq. KOH

2-propylbenzene on air oxidation and followed by decomposition by dilute acid givesA. phenol and propanalB. phenol and propanoneC. phenol and propanolD. phenol and propionic acid

The reaction Ph-OH + dilute `HNO_3 to ` ? Gives predominatelyA. 2-nitrocarbolicacidB. 4-nitrocarbolicacidC. 2,4,6- trinitrocarbolic acidD. 3-nitro carbolic acid

What is the general formula of ethers?

What are ethers? How are ethers classified?

Explain laboratory test of alcohols and phenols.

Which fo the following compounds is obtained when glycerol is heated with oxalic acid at 503K ?A. Formic acidB. Allyl alcoholC. Carbon dioxideD. Glycerol dioxalate

Anisole with conc. `HNO_(3)` and conc. `H_(2)SO_(4)` givesA. PhenolB. NitrobenzeneC. O - and - P - NitroanisoleD. O- Nitroanisole

Which one is formed when sodium phenoxide is heated with ethyl iodide?A. PhenetoleB. Ethyl phenyl alcoholC. PhenoneD. None of these

One mole of aniline warmed with the mixture of `NaNO_(2)+HCl`. If we assume 100% yield, volume of `N_(2)` gas liberated at S.T.P isA. `11.2 L`B. `22.4 L`C. `33.6 L`D. `44.8 L`

Sodium phenoxide when heated with `CO_(2)` under pressure at `125^(@) C` yield a product which on acetylation gives product `C` A. salolB. salicyladehydeC. sodium benzoateD. sodium salicylate

Which one of the following will be most recctive for `S_(N1` reaction?A. B. `C_(6)H_(5)-overset(OH)overset(|)(CH)-CH_(6)H_(5)`C. `CH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)C-CH_(3)`D.

The enzyme that converts cane sugar into invert sugar (a mixture of glucose and fructose) isA. DiastaseB. InvertaseC. ZymaseD. Maltase

Give the structures and IUPAC names of the products expected from the following reactions: (a) Catalytic reduction of butanal. (b) Hydration of propene in the presence of dilute sulphuric acid. (c) Reaction of propanone with methylmagnesium bromide followed by hydrolysis.

Arrange the following sets of compounds in order of their increasing boiling points: (a) Pentan-1-ol, butan-1-ol, butan-2-ol, ethanol, propan-1-ol, methanol. (b) Pentan-1-ol, n-butane, pentanal, ethoxyethane.

Which of the following is not characteristic of alcohols?A. Lower alcohols are stronger and have bitter tasteB. Higher alcohols are stronger and have bitter tasteC. The boiling points of alcohols increase with increasing molecular massD. The lower alcohol are soluble in water

Which one is not characteristic of alcohols ?A. They are lighter than waterB. Their B.P. rise uniformly with increasing molecular massC. Lower members are insoluble in water but solubility increases regularlyD. Lower members have pleasent odour and burning test

Which of the following is not characteristic of alcohols?A. Lower alcohols are stronger and have bitter tasteB. Higher alcohols are stronger and have bitter tasteC. The boiling points of alcohols increases with increasing molecular massD. The lower alcohols are soluble in water

The structure of the product (P ) of the following reaction is `:` A. B. C. D.

The major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide is :A. Benzoic acidB. salicylic acidC. salicylaldehydeD. phthalic acid

When sodium benzene sulphonate is fused with sodium hydroxide (solide), the product formed is `:`A. benzeneB. phenolC. benzene triphenolD. none of these

Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.