Question

The carbon atom in carbonyl group is ______ hybridised. The carbonyl group in aldehydes and ketones undergoes ______ reactions. Aldehydes which have $\alpha$- H atom undergo ______ reaction while aldehydes which have no $\alpha$-H atom undergo _______ reaction.

• A. $s{p}^3$, nucleophilic substitutions, aldol condensation, Cannizzaro
• B. $sp$, electrophilic substitution, Cannizzaro, aldol condensation
• C. $s{p}^2$, nucleophilic addition, aldol condensation, Cannizzaro
• D. $s{p}^3$, electrophilic addition, Cannizzaro, aldol condensation

Answer 1

The correct option is C $s{p}^2$, nucleophilic addition, aldol condensation, Cannizzaro

$3\sigma bond+1\pi bond=s{p}^2$

Since carbonyls are electron deficient species, they undergo nucleophilic addition. And for aldol reaction, one $\alpha -H$ is very very necessary otherwise it will undergo Cannizaro.