Question

Identify the set, in which X and Y are correctly matched:

• A. \( NH_2OH \), Hydrazone
• B. \( NH_2NH_2 \), Semicarbazone
• C. \( C_6H_5NH_2 \), Schiff base
• D. \( RNH_2 \), Oxime \

Hint:

Schiff bases (\( C=N \)) are formed when aldehydes react with primary aromatic amines like aniline (\( C_6H_5NH_2 \)). This reaction is a key step in organic synthesis.

Answer 1

The Correct Option is C

Step 1: Understanding the Reaction of Benzaldehyde 
- The given reaction involves benzaldehyde (\( C_6H_5CHO \)) undergoing a condensation reaction with a reagent \( X \).
- The product \( Y \) depends on the nature of \( X \). 

Step 2: Matching X and Y Correctly 
1. Hydrazone Formation (\( NH_2OH \)):
- Hydroxylamine (\( NH_2OH \)) reacts with aldehydes to form oximes, not hydrazones.
- Incorrect matching.
2. Semicarbazone Formation (\( NH_2NH_2 \)):
- Hydrazine (\( NH_2NH_2 \)) forms hydrazones, but not semicarbazones.
- Incorrect matching.
3. Schiff Base Formation (\( C_6H_5NH_2 \)):
- Aniline (\( C_6H_5NH_2 \)) reacts with benzaldehyde to form a Schiff base (C=N).
- Correct matching.
4. Oxime Formation (\( RNH_2 \)):
- Primary amines (\( RNH_2 \)) do not form oximes.
- Incorrect matching.
Step 3: Evaluating the Given Options 
- Option (1): Incorrect, as hydrazone is not formed with hydroxylamine.
- Option (2): Incorrect, as hydrazine does not form semicarbazones.
- Option (3): Correct, as Schiff base is correctly formed with aniline.
- Option (4): Incorrect, as oximes are not formed with general amines.
Thus, the correct answer is 

Option (3).