Question

Which of the given aldehydes will not give aldol condensation reactions?

(1) Propanal (2) Ethanal (3) $2.2$-dimethylpropane (4) $2,2$-dimethyl butanal (5) Benzaldehyde

• A. 1 and 4 only
• B. 1 and 2 only
• C. 2,3 and 4 only
• D. 3,4 and 5 only

Answer 1

The correct option is D 3,4 and 5 only

Aldol condensation is an organic reaction in which an enolate ion reacts with carboxyl compound in order to form a β– hydroxyaldehyde or β– hydroxyketone.The aldehyde or ketone that is going to be reacted should have an alpha hydrogen.

Following compounds will not give aldol condensation reaction

2,2-dimethyl propane its not an aldehyde or keetone

2,2-dimethyl butanal,Benzaldehyde these two compounds do not have alpha hydrogens.

Hnce option D is correct.