A student needs to confirm the presence of a carbonyl group in an unknown organic liquid. Which reagent provides a characteristic orange-red crystalline precipitate?
Q1. A student needs to confirm the presence of a carbonyl group in an unknown organic liquid. Which reagent provides a characteristic orange-red crystalline precipitate?
Answer: 2,4-Dinitrophenylhydrazine
Explanation: Aldehydes and ketones react with 2,4-DNPH to form yellow or orange-red crystalline phenylhydrazones. Option B is for the Tollen's test.