Chemistry - ALCOHOL & ETHER Question with Solution | TestHub

Question Explanation:

This is a matching question where specific chemical reactions/phenomena in List-I must be paired with the correct chemical reagents or structures in List-II.

Concept:

This question is based on 1,4-Addition (Conjugate Addition), Keto-Enol Tautomerism, Allylic Bromination, Alcohol Oxidation.

Solution:

(A)-1,4 addition: This occurs in alpha beta-unsaturated carbonyl compounds. Structure ( r ) is quinone, which is a highly electrophilic alpha betaunsaturated system capable of conjugate $(1,4)$ addition.

(B) - Tautomerism: Carbonyl compounds with alpha hydrogens undergo keto-enol tautomerism.

Structure (p) is an unsaturated ketone with alpha -hydrogens adjacent to the carbonyl group, allowing it

to tautomerize.

(C) - Allylic bromination: NBS (N-bromosuccinimide) is the specific reagent used for selective bromination at the allylic or benzylic position without affecting the double bond.

(D) PCC and NBS are used in preparation of ketone from $2^{\circ }$ alcohol.