InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Assertion: The `pK_(a)` of acetic acid is lower than that of phenol. Reason : Phenoxide ion is more resonance sabilised.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. |
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Answer» Correct Answer - C Lower the value of `pKa`, more acidic will be the compound. Acetic acid is more acidic than phenol. This indicates that carboxylate ion should be more stable than the phenoxide ion and it is clear that carboxylate ion has more equivalent resonating structures than the phenoxide ion. |
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| 152. |
Arrange the following in increasing order of their (i) Solubility and (ii) Boiling point |
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Answer» ` (i) IV lt III lt II lt I` ` (ii) I lt II lt III lt IV` |
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| 153. |
Ethanolic KOH givesA. dehalogenation reactionsB. dehydrogenation reactionC. dehydrohalogenation reactionsD. substitution reactions |
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Answer» Correct Answer - C Ethanolic KOH removes hydrogen and halogen atoms from a haloalkane, thus it is a dehydrogalogenating reagent and gives the same type of reactions. |
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| 154. |
C-O bond length in phenol is less than C-O bond length in methyl alcohol becauseA. partial double bond character due to resonanceB. partial double bond character due to inductive effectC. more electronegativity of oxygenD. oxygen contain two lone pair of electrons |
| Answer» Correct Answer - A | |
| 155. |
Which of the following functional groups, cannot be reduced to alcohol using `NaBH_(4)` in ethanolic solution ?A. R-O-RB. RCOClC. R-COOHD. R-CHO |
| Answer» Correct Answer - A | |
| 156. |
(a) Why acidic nature of alcohol and phenol increase with electron withdrawing substituent (b) Explain the order of acidic nature of |
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Answer» (a) EWGs decrease the charge density of oxygen hence increases the bond fission tendency ( b) Ortho isomer is acidic than para due to intramolecular H- bonding |
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| 157. |
Phenol is more acidic than alcohol because `:`A. phenol is more soluble in polar solventsB. alcohol does not lose hydrogen atomC. phenoxide ion is stabilised by resonanceD. phenoxide ion does not exhibit resonance |
| Answer» Correct Answer - C | |
| 158. |
Phenol on standing in air develop a red colour, due to formation ofA. cyclohexaneB. phenoquinoneC. resorcinolD. quinol |
| Answer» Correct Answer - B | |
| 159. |
The reaction of phenol with air. The product isA. AnthraquinoneB. BenzophenoneC. BenzoquinoneD. Propiophenone |
| Answer» Correct Answer - C | |
| 160. |
Which of the following functional groups can not be reduced by `H_2` / NiA. R-CHOB. R-COOHC. R-COO-RD. R-CO-R |
| Answer» Correct Answer - B | |
| 161. |
Phenol gives violet colour withA. neutral `FeCl_3`B. neutral `FeSO_4`C. acidic `FeCl_3`D. acidic `FeSO_4` |
| Answer» Correct Answer - A | |
| 162. |
Acidic nature of phenol is due toA. phenolic groupB. benzene groupC. hydrogen bondingD. resonance stabilisation of phenoxide ion |
| Answer» Correct Answer - D | |
| 163. |
Picric acid containA. 2-nitro groupsB. 3-nitro groupsC. 2-nitrite groupsD. 3-nitrite groups |
| Answer» Correct Answer - B | |
| 164. |
Which of the following alcoshols is the least soluble in water?A. EthanolB. 1-PropanolC. 1-ButanolD. 1-Pentanol |
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Answer» Correct Answer - D |
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| 165. |
3-ethyl pentan-3-ol is obtained by `C_2H_5MgBr` and what?A. pentan-2-oneB. pentan-3-oneC. pentanalD. 3-methyl butan-2-one |
| Answer» Correct Answer - B | |
| 166. |
Reactivity of alcohol in breaking of C-O bond isA. `1^@ gt 2^@ gt 3^@ `B. `3^@ gt 2^@ gt 1^@ `C. `3^@ gt 1^@ gt 2^@ `D. `1^@ gt 3^@ gt 2^@ ` |
| Answer» Correct Answer - B | |
| 167. |
Picric acid isA. trinitroanilineB. trinitrotolueneC. a volatile liquidD. 2, 4, 6-trinitrophenol |
| Answer» Correct Answer - D | |
| 168. |
Picric acid is obtained by the nitration ofA. cumeneB. phenolC. methanolD. ethanol |
| Answer» Correct Answer - B | |
| 169. |
`Ph - underset(OH) underset(|)overset(CH_(3))overset(|)(C) - underset(OH) underset(|)overset(Ph)overset(|)(C) - Ph underset(H_(2)SO_(4))overset("Conc")rarr` Product isA. `Ph - underset(OH) underset(|)overset(CH_(3))overset(|)(C) - underset(OH) underset(|)overset(Ph)overset(|)(C) - CH_(3)`B. `Ph - underset(O)underset(||)(C) - underset(O) underset(||) (C) - Ph`C. `CH_(3) - underset(O)underset(||)(C)-underset(Ph)underset(|)overset(Ph)overset(|)(C) - CH_(3)`D. `Ph - underset(O)underset(||)(C) - underset(O)underset(||)(C) - CH_(3)` |
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Answer» Correct Answer - C |
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| 170. |
Acidic character of alcohols depends up onA. number of alkyl groupsB. polarity of -OH groupsC. types of alkyl groupsD. all of these |
| Answer» Correct Answer - D | |
| 171. |
Reactivity of alcohol in breaking O-H bond isA. `1^@ gt 2^@ gt 3^@ `B. `3^@ gt 2^@ gt 1^@ `C. `2^@ gt 1^@ gt 3^@ `D. `1^@ gt 3^@ gt 2^@ ` |
| Answer» Correct Answer - A | |
| 172. |
`(CH_(3))_(3)C - OH overset(H_(2)SO_(4)) rarr (CH_(3))_(2) C = CH_(2)`, This reaction takes place throughA. `S_(N)1` mechanismB. `S_(N)2` mechanismC. `E_(1)` mechanismD. `E_(2)` mechanism |
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Answer» Correct Answer - C |
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| 173. |
Which of the following is strong baseA. `CH_3ONa`B. `NaOH`C. KOHD. `Na_2CO_3` |
| Answer» Correct Answer - A | |
| 174. |
Assertion(A): In the fermentation process of molasses, along with yeast `(NH_(4))_(2)SO_(4), (NH_(4))_(3) PO_(4)` is added Reason (R): `(NH_(4))_(3)PO_(4)` and `(NH_(4))_(2)SO_(4)`, act as food and helps the growth of yeast.A. Both A and R are true and R is the correct explanation to AB. Both A and R are true and R is not the correct explanation to AC. A is true but R is falseD. A is false but R is true |
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Answer» Correct Answer - A |
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| 175. |
The reaction between an alcohol and carboxylic acid leads to the formation ofA. AldehydeB. EsterC. KetoneD. Paraffins |
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Answer» Correct Answer - B |
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| 176. |
A compound `X` of formula `C_(3)H_(8)O` yields a compound `C_(3)H_(6)O`, on oxidation. To which of the following classes of compounds could `X` beingA. Secondary alcoholB. AlkeneC. AldehydeD. Teriary alcohol |
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Answer» Correct Answer - A `2^(@)` alcohols give Ketones with same no. of `C-`atoms. |
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| 177. |
The two enzymes present in yeast that are responsible for the formation of ethylalcohol from molasses in the fermentation process areA. Invertase, zymaseB. invertase, diastaseC. Zymase, diastaseD. Invertase, maltase |
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Answer» Correct Answer - A |
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| 178. |
An alcohol on oxidation is found to given `CH_(3)COOH` and `CH_(3)CH_(2)COOH`. The structure of the alcohol isA. `CH_(3)CH_(2)CH_(2)OH`B. `(CH_(3))_(2)C(OH)CH_(2)CH_(3)`C. `CH_(3)CH_(2)CHOHCH_(3)`D. `CH_(3)CH(OH)CH_(2)CH_(2)CH_(3)` |
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Answer» Correct Answer - D `3^(@)` alcohols give acid with less carbon atoms. |
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| 179. |
Consider the following reaction `C_(2)H_(5)Ioverset(Delta)underset(X)rarr` (pleasant smelling liquid) X isA. SodiumB. Dry silver oxideC. Ethyl chlorideD. Dry silver powder |
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Answer» Correct Answer - B |
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| 180. |
Which of the following is more acidic alcohol?A. `C_2H_5OH`B. `CH_3-undersetunderset(OH)|CH-CH_3`C. `CH_3-CH_2-CH_2-OH`D. `(CH_3)_3-OH` |
| Answer» Correct Answer - A | |
| 181. |
Which of the following is most acidicA. `H_2O`B. `CH_3-OH`C. `C_2H_5-OH`D. `C_3H_7-OH` |
| Answer» Correct Answer - A | |
| 182. |
An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling. A with conc. `H_(2)SO_(4)` a colourless gas is produced which decolourises bromine water and alkaline `KMnO_(4)`. One mole of this gas also takes one mole of `H_(2)`. The organic liquid `A` isA. `C_(2)H_(5)Cl`B. `C_(2)H_(5)CO OCH_3`C. `C_2H_5 OH`D. `C_2 H_6` |
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Answer» Correct Answer - C The organic liquid A is `C_2H_5OH` Ethly alchol is a colourless liquid with a characyteristic pleasant smell, having boiling point `78.1 ^@ C` (ii) `underset("and alkaline"KMnO_4)underset("Decolourises" Br_2 "water")(C_2H_5OH overset("Conc"H_2SO_4)rarrCH_2=CH_2` |
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| 183. |
Asserion: A small amount of ethanol is added to `CHCI_(3)` bottles. Reason: It acts as negative catalyst for the oxidation of `CHCI_(3)` to `COCI_(2)`.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. |
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Answer» Correct Answer - A If both assertion and reason are true and the reaosn is the correct explanantion of the asserion. |
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| 184. |
Decreasing order of acidity of following alcohol is A. 1 gt 2 gt 4 gt 3B. 3 gt 1 gt 4 gt 2C. 2 gt 3 gt 1 gt 4D. 2 gt 1 gt 3 gt 4 |
| Answer» Correct Answer - D | |
| 185. |
An organic liquid `A` containing `C,H` and `O` has a pleasant odour with a boiling point of `78^(@)C`. On boiling. A with conc. `H_(2)SO_(4)` a colourless gas is produced which decolourises bromine water and alkaline `KMnO_(4)`. One mole of this gas also takes one mole of `H_(2)`. The organic liquid `A` isA. `C_(2)H_(5)Cl`B. `C_(2)H_(5)COOCH_(3)`C. `C_(2)H_(5)OH`D. `C_(2)H_(6)` |
| Answer» Correct Answer - C | |
| 186. |
Assertion: Ethanol is more viscous than glycerol. Reason: Both posses `H-`bonding.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. |
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Answer» Correct Answer - D Glycerol is more viscous then ethanol due to more extensive `H`-bonding. |
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| 187. |
Which of the following is most acidic ?A. B. C. D. |
| Answer» Correct Answer - A | |
| 188. |
Order of acidity of alcohol isA. `1^@` gt `2^@` gt `3^@`B. `3^@` gt `2^@` gt `1^@`C. `1^@` gt `3^@` gt `2^@`D. `3^@` gt `1^@` gt `2^@` |
| Answer» Correct Answer - A | |
| 189. |
Which of following is the most viscous liquid ?A. `C_2H_5OH`B. `{:(CH_2-,CH_2),(|, "|"),(OH,OH):}`C. `{:(CH_2-,CH-,CH_2),(|, "|","|"),(OH,OH,OH):}`D. `HO-CH_2(CHOH)_4CH_2-OH` |
| Answer» Correct Answer - D | |
| 190. |
Which of the following is expected to have highest boiling point ?A. `(CH_3)_2CHCl`B. `(CH_3)_2CHOH`C. `CH_3CH_2CH_2OH`D. `CH_3CH_2CH_2Cl` |
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Answer» Correct Answer - C Alcohols have highest boiling point because of presence of hydrogen bonding. Normal alcohols have higher boiling point than isomeric branched alcohols. Compound (C) is normal propyl alcohol and compound (B) is branched propyl alcohol. |
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| 191. |
In the following compound order of acidity is A. 4 gt 2 gt 3 gt1B. 4 gt 3 gt 1 gt2C. 4 gt 3 gt 2 gt1D. 4 gt 1 gt 2 gt 3 |
| Answer» Correct Answer - B | |
| 192. |
Which of the following has more Ka value ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 193. |
Ka value of phenol isA. More than carboxylic acidB. Less than alcoholC. More than alcoholD. Less than water |
| Answer» Correct Answer - C | |
| 194. |
Which of following has highest B.PA. `CH_3-O-CH_3`B. `C_2H_5-OH`C. `C_2H_5-Cl`D. `CH_3-CHO` |
| Answer» Correct Answer - B | |
| 195. |
In which of the following first is more acidic than second ?A. B. C. D. |
| Answer» Correct Answer - B | |
| 196. |
Strength of acidity is in order: A. II `gt` I `gt `III `gt` IVB. III `gt` IV ` gt ` I `gt ` IIC. I `gt` IV `gt` III `gt ` IID. IV `gt ` III `gt` I `gt` II |
| Answer» Correct Answer - B | |
| 197. |
The order of melting point of ortho, para, meta nitrophenol isA. o gt m gt pB. p gt m gt oC. m gt p gt oD. p gt o gt m |
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Answer» Correct Answer - B Due to intramolecular hydrogen bonding in ortho-isomer, it has least melting point. Due to effective intermolecular hydrogen bonding and close packed structure in para-isomer, it has highest melting point among the isomers. So, the order is para `(114^(@)C) gt "meta "(97^(@)C) gt "ortho"(45^(@)C)` |
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| 198. |
Which of the following has highest Ka value ?A. B. C. D. |
| Answer» Correct Answer - D | |
| 199. |
In which of the following first is more acidic than second ?A. B. C. D. |
| Answer» Correct Answer - D | |
| 200. |
In the following compounds The order of acidity is-A. III `gt` IV `gt` I `gt ` IIB. I `gt` IV `gt` III` gt` IIC. II `gt` I `gt` III `gt` IVD. II `gt` III `gt ` I` gt ` II |
| Answer» Correct Answer - D | |