Alcohols, Phenols & Ethers PYQs Set 2 (PDF)

Set 2 of 14 · Questions 31-60 of 396

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Mere Teacher · Previous Year Questions NEET Chemistry · Alcohols, Phenols & Ethers · Set 2 (Q31-60)
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31. $The distinguishing test between methanoic acid and ethanoic acid is$ (1) $Tollens' test$ (2) $sodium bicarbonate test$ (3) $litmus test$ (4) $esterification test.$ 32. $The reaction, C_{2} H_{5} ONa + C_{2} H_{5} I \to C_{2} H_{5} OC_{2} H_{5} + NaI is known as$ (1) $Kolbe's synthesis$ (2) $Wurtz's synthesis$ (3) $Williamson's synthesis$ (4) $Grignard's synthesis.$ 33. $The reagent which can do the conversion, CH_{3} COOH ⟶ CH_{3} - CH_{2} - OH is$ (1) $LiAlH_{4} /ether$ (2) $H_{2}, Pt$ (3) $NaBH_{4}$ (4) $Na and C_{2} H_{5} OH$ 34. $Which of the following compounds has lowest boiling point?$ (1) $n-butyl alcohol$ (2) $isobutyl alcohol$ (3) $tert-butyl alcohol$ (4) $sec-butyl alcohol$ 35. $A mixed ether (P), when heated with excess of hot concentrated hydrogen iodide produces two different alkyl iodides which when treated with aq. NaOH give compounds (Q) and (R) . Both (Q) and (R) give yellow precipitate with NaOI. Identify the mixed ether (P) :$ (1) $CH_{3} CH = C (CH_{3}) -O-CH_{2} CH_{3}$ (2) $Ph-CH_{2} -O-CH (CH_{3}) CH_{2} CH_{3}$ (3) $CH_{3} CH_{2} -O-C (CH_{3})_{2} CH_{2} CH_{3}$ (4) $CH_{3} CH_{2} -O-CH(Ph)-CH_{2} CH_{3}$ 36. $Ethyl chloride is converted into diethyl ether by$ (1) $Perkins reaction$ (2) $Grignard reaction$ (3) $Wurtz synthesis$ (4) $Williamson’s synthesis.$ 37. $Propanoic acid undergoes HVZ reaction to give chloropropanoic acid. The product obtained is$ (1) $stronger acid than propanoic acid$ (2) $as stronger as propanoic acid$ (3) $weaker acid than propanoic acid$ (4) $stronger than dichloropropanoic acid.$ 38. $Which of the following reagents can be used to distinguish a phenol and an alcohol?$ (1) $Ammoniacal AgNO_{3}$ (2) $Ammoniacal Cu_{2} Cl_{2}$ (3) $Aqueous ferric chloride$ (4) $Neutral ferric chloride$ 39. $Which of the following on heating gives an ether as major product? P: C_{6} H_{5} CH_{2} Br + CH_{3} ONa Q: C_{6} H_{5} ONa + CH_{3} Br R: (CH_{3})_{3} C - Cl + CH_{3} ONa S: C_{6} H_{5} CH = CHCl + CH_{3} ONa$ (1) $Both P and R$ (2) $Both Q and S$ (3) $Both P and Q$ (4) $Both R and S$ 40. $The compound that is most difficult to protonate is$ (1) $P h - O - H$ (2) $H - O - H$ (3) $H_{3} C - O - H$ (4) $H_{3} C - O - C H_{3}$ 41. $Which of the following compound would not evolve CO_{2} when treated with NaHCO_{3} solution?$ (1) $Salicylic acid$ (2) $Phenol$ (3) $Benzoic acid$ (4) $4-nitrobenzoic acid.$ 42. $Which of the following is strongly acidic?$ (1) $Phenol$ (2) $o-Cresol$ (3) $p-Nitrophenol$ (4) $p -Cresol$ 43. $Which among the following phenolic compounds is most acidic in nature?$ (1) $p -aminophenol$ (2) $phenol$ (3) $m -nitrophenol$ (4) $p-nitrophenol$ 44. $(+)-2-Methylbutan-1-ol and (-)-2-methylbutan-1-ol have different values for which property?$ (1) $Boiling point$ (2) $Relative density$ (3) $Refractive index$ (4) $Specific rotation$ 45. $Incorrect method of preparation for alcohols from the following is:$ (1) $Reaction of Ketone with RMgBr followed by hydrolysis.$ (2) $Reaction of alkyl halide with aqueous NaOH.$ (3) $Hydroboration-oxidation of alkene.$ (4) $Ozonolysis of alkene$ 46. $The compound that is most difficult to protonate is [NEET 2019]$ (1) $P h - O - H$ (2) $H - O - H$ (3) $H_{3} C - O - H$ (4) $H_{3} C - O - C H_{3}$ 47. $Select the ether among following that yields methanol as one of the products on reaction with cold hydroiodic acid.$ (1) $1-Methoxybutane$ (2) $1-Methoxy-2-methylpropane$ (3) $2-Methoxy-2-methylpropane$ (4) $Methoxybenzene$ 48. $Assertion (A) : Tertiary alcohols produce turbidity immediately with Lucas reagent.Reason (R) : Lucas reagent is a 1 : 1 mixture of conc. HNO_{3} and anhydrous ZnCl_{2} .The correct option among the following is$ (1) $(A) is true, (R) is true and (R) is the correct explanation for (A)$ (2) $(A) is true, (R) is true but (R) is not the correct explanation for (A)$ (3) $(A) is true but (R) is false$ (4) $(A) is false but (R) is true$ 49. $Iodoform can be prepared from all, except$ (1) $butan-2-one$ (2) $acetophenone$ (3) $propan-2-ol$ (4) $propan-1-ol.$ 50. $Which of the following can be used to test the acidic nature of ethanol?$ (1) $Blue litmus solution$ (2) $Na_{2} CO_{3}$ (3) $NaHCO_{3}$ (4) $Na metal$ 51. $Benzaldehyde and acetone can be best distinguished using$ (1) $Fehling's solution$ (2) $sodium hydroxide solution$ (3) $2,4-DNP$ (4) $Tollens' reagent$ 52. $The reagent used in Clemmensen reduction is$ (1) $conc. H_{2} SO_{4}$ (2) $Zn - Hg / conc. HCl$ (3) $aq. KOH$ (4) $alc. KOH,$ 53. $Which of the following reaction(s) can be used for the preparation of alkyl halides? (I) CH_{3} CH_{2} OH + HCl Anhyd . ZnCl_{2} (II) CH_{3} CH_{2} OH + HCl ⟶ (III) (CH_{3})_{3} COH + HCl ⟶ (IV) (CH_{3})_{2} CHOH + HCl Anhyd . ZnCl_{2}$ (1) $I, III and IV$ (2) $I and II$ (3) $Only IV$ (4) $III and IV$ 54. $Which one of the following compounds will be most readily attacked by an electrophile?.$ (1) $Chlorobenzene$ (2) $Benzene$ (3) $Phenol$ (4) $Toluene$ 55. $Which of the following compounds is most acidic?$ (1) $Cl - CH_{2} - CH_{2} - OH$ (2) (3) (4) 56. $Among the following four compounds(i) Phenol(ii) Methyl phenol(iii) Meta‐nitrophenol(iv) Para‐nitrophenol. The acidity order is$ (1) $(i v) > (iii) > (i) > (ii)$ (2) $(iii) > (i v) > (i) > (ii)$ (3) $(i) > (i v) > (iii) > (ii)$ (4) $(ii) > (i) > (iii) > (i v)$ 57. $The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with$ (1) $PCl_{5}$ (2) $SOCl_{2} in presence of pyridine$ (3) $Dry HCl in the presence of anhydrous ZnCl_{2}$ (4) $PCl_{3}$ 58. $The compound CH_{3} - CH = CH - CH_{2} - OH is also called as$ (1) $ethylene glycol$ (2) $crotonyl alcohol$ (3) $propylene glycol$ (4) $benzenol$ 59. $Given below are two statements: Statement I: Dimethyl ether is completely soluble in water. However, diethyl ether is soluble in water to a very small extent. Statement II: Sodium metal can be used to dry diethyl ether and not ethyl alcohol. In the light of given statements. choose the correct answer from the options given below$ (1) $Statement I is false but Statement II are true$ (2) $Statement I is true but Statement II is false$ (3) $Both Statement I and Statement II are true$ (4) $Both Statement I and Statement II are False$ 60. $Match List - I with List - II. List - I Functional group (detection) (A) Unsaturation (Baeyer’s test) (B) Alcoholic group (Ceric ammonium nitrate test) (C) Aldehyde group (Tollen’s reagent) (D) Phenolic group (FeCl_{3} test) List - IIChange observed during detection (I) Red colour appears (II) Silver mirror appears (III) Violet colour appears (IV) Discharge of pink colour Choose the correct answer from the options given below :$ (1) $A-III, B-IV, C-II, D-I$ (2) $A-IV, B-I, C-II, D-III$ (3) $A-IV, B-III, C-II, D-I$ (4) $A-III, B-IV, C-I, D-II$