First slide

Antacids , Antihistamines

Question

${CH}_{3} CHO \to_{Δ}^{dil . NaOH} X . X is$

Easy

A

${CH}_{3} - CH = CH - CHO$
B

${({CH}_{3})}_{2} CH - {CH}_{2} - CHO$
C

${CH}_{2} = CH - {CH}_{2} - CHO$
D

${({CH}_{3})}_{2} CH - CHO$

Solution

Carbonyl compounds containing $α$ -hydrogen atoms undergo condensation in presence of dil.alkali to form $β$ -hydroxy carbonyl compound Aldol (or) ketol.
Aldol (or ketol) on heating gives $α, β$ -unsaturated carbonyl compound.

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