Question

Which of the following would give Aldol condensation reaction?

• A. CCl$_3$CHO
• B.

  

• C. CH$_3$CHO
• D. HCHO

Hint:

Aldol condensation typically requires an aldehyde or ketone with a hydrogen atom on the alpha carbon (next to the carbonyl group) to form an enolate ion.

Answer 1

The Correct Option is B

Step 1: Understand Aldol condensation.
Aldol condensation is a reaction in which an enolate ion of an aldehyde or ketone reacts with another aldehyde or ketone molecule to form a β-hydroxy aldehyde or ketone, which then undergoes dehydration to give an α,β-unsaturated carbonyl compound.
Step 2: Identify the compounds capable of Aldol condensation.
- CCl$_3$CHO (Option A) is a chloro-aldehyde, which does not participate in Aldol condensation. - CH$_3$-C-CHO (Option B) is an aldehyde with a hydrogen atom adjacent to the carbonyl group, making it suitable for Aldol condensation. - CH$_3$CHO (Option C) is acetaldehyde, but it is too simple for the reaction to take place effectively in this context. - HCHO (Option D) is formaldehyde, which is not typically used in Aldol condensation reactions.
Step 3: Apply to the options.
The correct compound for Aldol condensation is (B) CH$_3$-C-CHO.
Final Answer: \[ \boxed{\text{CH}_3\text{-C-CHO}} \]