Question

The CORRECT option(s) of ( Y ) for the following reaction is/are: 

• A.
• B.
• C.
• D.

Hint:

The ( ce{2,4-dinitrophenylhydrazine} ) test is used to detect aldehydes and ketones. Esters, amides, and other functional groups do not form hydrazones with ( ce{2,4-dinitrophenylhydrazine} ).

Answer 1

The Correct Option is A, C

Step 1: Reaction mechanism overview.

This reaction involves the formation of a 2,4-dinitrophenylhydrazone derivative, a classic test for the presence of carbonyl compounds (aldehydes and ketones). The \( \ce{2,4-dinitrophenylhydrazine} \) reacts with carbonyl compounds to form hydrazones. The reaction is highly specific for compounds with a carbonyl group (\( \ce{-CHO} \) or \( \ce{C=O} \)).

Step 2: Analyzing the options.

• Option (A): Contains a carbonyl group (\( \ce{-CHO} \)), making it reactive under the given conditions.
• Option (B): Contains an ester functional group (\( \ce{COOR} \)), which does not react with \( \ce{2,4-dinitrophenylhydrazine} \).
• Option (C): Contains a carbonyl group (\( \ce{C=O} \)), making it reactive under the given conditions.
• Option (D): Contains an amide group (\( \ce{CONH2} \)), which does not react with \( \ce{2,4-dinitrophenylhydrazine} \).

Step 3: Conclusion.

The compounds with a reactive carbonyl group are present in options (A) and (C).