Chemistry - Carbonyl compounds Question with Solution | TestHub

${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CHO}$ undergoes aldol condensation.

as major product when treated with KOH

$\mathrm{Ph}-\mathrm{CH}=\mathrm{CH}-\mathrm{CHO}$ does not undergo aldol condensation.

When an aldehyde and a ketone undergo cross-aldol condensation, it is the $\alpha -\mathrm{H}$ of ketone which is involved in carbanion formation producing major product.