Organic Chemistry PYQs – Set 67

By Atul Sahu • Organic Chemistry, Subject Wise PYQs

Organic Chemistry PYQs – Set 67

Subject : Organic Chemistry

1321. How many stereoisomers are possible for 3-bromo-2-butanol?

Organic Chemistry • Isomerism • GPAT 2021

A. 2 B. 4 C. 6 D. 8

1322. How many optical isomers are possible for lactic acid?

Organic Chemistry • Isomerism • GPAT 2021

A. 2 B. 4 C. 6 D. 8

1323. Anthracene is isomeric with:

Organic Chemistry • Isomerism • GPAT 2021

A. Phenanthrene B. Naphthalene C. Benzene D. Azulene

1324. Which of the following best defines diastereomers?

Organic Chemistry • Isomerism • GPAT 2021

A. They have the same magnitude but opposite sign of optical rotation B. They are non-superimposable mirror images C. They differ in physical properties and are not mirror images D. They have very similar physical properties making separation difficult

1325. How many optical isomers are possible for lactic acid:

Organic Chemistry • Isomerism • GPAT 2021

A. 2 B. 6 C. 0 D. 4

1326. In which rearrangement reaction is isocyanate formed?

Organic Chemistry • Name Reactions • GPAT 2021

A. Curtious B. Lossen C. Both A & B D. None

1327. In the Reimer-Tiemann reaction, which species reacts with phenol to yield the ortho-formylated product?

Organic Chemistry • Name Reactions • GPAT 2021

A. Carbene B. Carbocation C. Carbanion D. Free radical

1328. The given reaction is an example of

Organic Chemistry • Name Reactions • GPAT 2021

A. Arndt-Eistert homologation B. Mannich reaction C. Michael addition D. Chichibabin amination reaction

1329. The product of a Michael reaction between a ketone enolate and an α,β-unsaturated ketone is

Organic Chemistry • Name Reactions • GPAT 2021

A. 1,5-deketone; 1,4-fashion B. β-substituted acetate; 1,2-fashion C. β-hydroxy keto; 1,3-fashion D. α,β-keto ester; 1,5-fashion

1330. Which reagent from the given can be used to protect a ketone group?

Organic Chemistry • Name Reactions • GPAT 2021

A. Acidic methanol B. Basic methanol C. Methanol + KCN D. None of these

1331. In pinacol–pinacolone rearrangement, the final product is a ketone. What is the starting compound for the rearrangement?

Organic Chemistry • Name Reactions • GPAT 2021

A. 1,1-diol B. 1,2-diol C. 1,3-diol D. Geminal diol

1332. Toluene is converted to which compound in the presence of CrO₃ and acetic anhydride?

Organic Chemistry • Name Reactions • GPAT 2021

A. Benzyl alcohol B. Benzaldehyde C. Benzoic acid D. Benzoin

1333. Why does acetyl chloride undergo nucleophilic substitution at a faster rate than methyl acetate?

Organic Chemistry • Name Reactions • GPAT 2021

A. The ester is more sterically hindered than the acid chloride B. The chloride ion is a better leaving group than methoxide C. The acid chloride is more sterically hindered than the ester D. The methoxide ion is a better leaving group than chloride

1334. The product of a Michael reaction of a ketone enolate to an α,β‑unsaturated ketone is formed, and the addition reaction occurs in a/an

Organic Chemistry • Name Reactions • GPAT 2021

A. 1,5‑deketone; 1,4‑fashion B. β‑substituted acetate; 1,2‑fashion C. β‑hydroxy keto; 1,3‑fashion D. α,β‑keto ester; 1,5‑fashion

1335. Which of the following reagents can be used to protect a ketone group?

Organic Chemistry • Name Reactions • GPAT 2021

A. Acidic methanol B. Basic methanol C. Methanol + KCN D. Phenobarbitone

1336. When trans‑2‑butene is treated with bromine, an anti‑addition of bromine yields meso‑2,3‑dibromobutane. Select the correct statement regarding the reaction

Organic Chemistry • Name Reactions • GPAT 2021

A. The reaction is stereoselective as well as stereospecific B. The reaction is stereoselective and not stereospecific C. The reaction is nonstereoselective as well as non stereospecific D. The reaction is stereospecific and not stereoselective

1337. Reduction of imines to give amines in protic solvents can be carried out by which reagent?

Organic Chemistry • Name Reactions • GPAT 2021

A. Sodium hydride B. Sodium chloride and HCl C. Lithium aluminium chloride D. Sodium cyanoborohydride

1338. Which of the following is a 3,3‑sigmatropic reaction which converts a 1,5‑diene to an isomeric 1,5‑diene?

Organic Chemistry • Name Reactions • GPAT 2021

A. Cope rearrangement B. Claisen rearrangement C. Photochemical [2+2] reaction D. Diels‑Alder reaction

1339. Reaction of an α-halo ester with an aldehyde or ketone in the presence of a base like NaNH2 gives α,β-epoxy carboxylic ester. This reaction is referred as :

Organic Chemistry • Name Reactions • GPAT 2021

A. Willgerodt rearrangement B. Bamford steven reaction C. Darzen’s glycidic synthesis D. Bayer villiger rearrangement

1340. Conversion of aryldiamnium chloride to arylchloride can be achieved in the presence of :

Organic Chemistry • Name Reactions • GPAT 2021

A. Copper (II) chloride B. Copper (I) chloride C. Sodium chloride D. Calcium chloride

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