IIT-JEE 2012 · Paper 1 · Chemistry Q27

ChemistrySingle correct+3 / -1Question 27 of 60

The carboxyl functional group (-COOH) is present in

picric acid

barbituric acid

ascorbic acid

aspirin

Answer and worked solution

Official answer: D

Picric acid is 2,4,6-trinitrophenol: an acidic phenol, no COOH.
Barbituric acid is a cyclic ureide (pyrimidinetrione); its acidity comes from an active CH₂/NH, not a COOH.
Ascorbic acid is a lactone with an enediol; its acidity is from an enolic OH.
Aspirin is 2-acetoxybenzoic acid: it has a -COOH group.

(D)

Topics:Carboxylic acids

IIT-JEE 2012 · Paper 1, Chemistry question 27