Question

This given conversion can be done by:

• A. Clemmensen reduction
• B. Retro-aldol condensation
• C. Perkin condensation
• D. dehydration followed by hydrolysis

Answer 1

The correct option is B Retro-aldol condensation

Aldehydes having $\alpha$hydrogen (s) undergo self -condensation on warming with the dilute or mild base to give $\beta$- hydroxy aldehydes, called aldol (adehyde+ alcohol). This reaction is known as aldol condensation.

A typical example is the reaction of acetaldehyde with a base under mild condition.

This given conversion can be done by a retro-aldol condensation reaction. Aldol condensation is a convergence of carbonyl compounds, having $\alpha H$ in $\beta$ hydroxy carbonyl compound called aldol( aldehyde + alcohol ) in presence of a mild base. Hence the given reverse reaction is known as retro-aldol condensation reaction.