A student is given an unknown liquid and asked to confirm if it contains a carbonyl group. Which reagent provides a crystalline derivative?
Q1. A student is given an unknown liquid and asked to confirm if it contains a carbonyl group. Which reagent provides a crystalline derivative?
Answer: 2,4-Dinitrophenylhydrazine
Explanation: 2,4-DNPH identifies the carbonyl group by forming colored crystalline solids. Tollen's test is tempting but only differentiates aldehydes from ketones, not functional presence.