Match List-I with List-II.List-I(Compound)List-II(Class)(A) Ethane-1,…

The correct answer is Option (1) → A-II, B-IV, C-III, D-I

Two questions decide the class. Is the –OH group on a carbon of an aliphatic system (alcohol) or directly on a carbon of the benzene ring (phenol)? And how many –OH groups are there: one, two or three (mono-, di- or trihydric)?

(A) Ethane-1,2-diol, HOCH₂–CH₂OH — This matches (II) Dihydric alcohol. Two –OH groups, both on sp³ carbons of an alkyl chain.

(B) Benzene-1,2-diol — This matches (IV) Dihydric phenol. Two –OH groups, both attached directly to the ring.

(C) Phenylmethanol, C₆H₅CH₂OH — This matches (III) Monohydric alcohol. The –OH group is on the CH₂ carbon next to the ring, not on the ring, so it is a benzylic alcohol, not a phenol.

(D) 2-Methylphenol — This matches (I) Monohydric phenol. It has one –OH group on the ring; the methyl group does not change the class.

NCERT (2026-27 edition):
Alcohols, Phenols and Ethers – “An alcohol contains one or more hydroxyl (OH) group(s) directly attached to carbon atom(s), of an aliphatic system (CH₃OH) while a phenol contains –OH group(s) directly attached to carbon atom(s) of an aromatic system (C₆H₅OH).”

7.1.1 Alcohols— Mono, Di, Tri or Polyhydric alcohols – “Alcohols and phenols may be classified as mono–, di–, tri- or polyhydric compounds depending on whether they contain one, two, three or many hydroxyl groups respectively in their structures…”

“Benzylic alcohols: In these alcohols, the —OH group is attached to a sp³—hybridised carbon atom next to an aromatic ring.”

7.1.2 Phenols— Mono, Di and trihydric phenols