Chemistry NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 11 PCB Single Correct MCQ
Published on: August 13, 2026

A toxic compound ' P ' when treated with CO under and 50 bar yields ' Q ' which is a commonly used vinegar component. Compound ' Q ' reacts with alcohol in presence of conc. to form ester ' R ' a fruity-smelling substance. Upon hydrolysis, ' R ' regenerates ' Q ' and alcohol ' S '. Identify ' P ', ' Q ', ' R ' and ' ' respectively.

A
Methanol; acetic acid; ethyl acetate; ethanol
B
Ethanal; propanoic acid; methyl propanoate; methanol
C
Formaldehyde; formic acid; ethyl formate; ethanol
D
Acetaldehyde; acetic acid; propyl acetate; propanol

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The correct answer is:
A

Vinegar component is acetic acid (Q). It esterifies with ethanol to give fruity ethyl acetate (R), which on hydrolysis gives back acetic acid (Q). and ethanol (S). Methanol (P) is a toxic feedstock used industrially (via carbonylation) to make acetic acid.

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