Chemistry - Carbonyl compounds Question with Solution | TestHub

Question Explanation:  

To Identify the compound that will not give aldol condensation :

Concept:  

This question is based on Aldol Condensation .

Solution:  

Aldol condensation occurs only in aldehydes and ketones that contain at least one α-hydrogen, which is necessary for enolate ion formation under basic conditions.

1. Acetaldehyde (CH₃CHO): The α-carbon has three α-hydrogens, so it readily undergoes aldol condensation.

2. Formaldehyde (HCHO): Lacks an α-carbon and therefore has no α-hydrogen. It does not undergo aldol condensation and instead gives the Cannizzaro reaction.

3. Pivaldehyde (Me₃CCHO): The α-carbon is quaternary and has no α-hydrogens, so it does not undergo aldol condensation and undergoes the Cannizzaro reaction instead.

4. Crotonaldehyde (CH₃CH=CH-CHO): has  α-hydrogen, so it can undergo aldol condensation. Final Answer: Options (B) and (C)