Question

Reagent, which do not react with acetone and benzaldehyde:

• A. Sodium hydrogen sulphite
• B. Phenyl hydrazine
• C. Fehling's solution
• D. Grignard reagent

Hint:

Grignard reagents do not react directly with acetone and benzaldehyde to form addition products like other reagents (e.g., phenyl hydrazine or sodium bisulfite).

Answer 1

The Correct Option is D

- Sodium hydrogen sulphite reacts with aldehydes and ketones to form addition compounds, such as bisulfite adducts.
- Phenyl hydrazine reacts with carbonyl compounds (like acetone and benzaldehyde) to form hydrazones.
- Fehling's solution reacts with aldehydes, especially in the presence of a reducing agent.
- Grignard reagents do not react directly with acetone or benzaldehyde, as they are more likely to react with carbonyl compounds to form alcohols upon hydrolysis. Grignard reagents typically do not react with the carbonyl group in the way that sodium bisulfite or hydrazine does.
Therefore, the correct answer is option (D) Grignard reagent.