Question

Reaction of primary amines with aldehyde yields
A. Amides
B. Aldimines
C. Nitriles
D. Nitro compounds

Answer 1

Hint: Amine is a basic compound. It acts as a base. The reactions of primary amines are known as carbylamine reactions.

Complete Step by Step Answer:
Primary amine is a base. The nitrogen atom of primary amine contains lone pair of electron which can be donated easily to any species. In aldehyde the carbon atom gets positive charge and the oxygen atom gets negative charge thus the lone pair of nitrogen attacks the carbon atom of aldehyde and ultimately water is removed to form the final product aldimines. Primary amine, a base on reaction with aldehyde, produces aldimine as a major product with water as a minor product. The reaction can be given as follows:
$R-C{{H}_{2}}-N{{H}_{2}}+R-\left( CO \right)-H\to R-C{{H}_{2}}-N=CH-R$
Reaction of primary amines with aldehyde yields Aldimines as a major product.
Thus the correct option is B.

Additional information: Aldehyde is a carbonyl compound. It is more reactive than ketone. The carbon atom on aldehyde acts as an electrophile and the nitrogen atom of primary amine acts as a base or nucleophile. Thus the nitrogen atom of the primary amine can easily attack the aldehyde and remove water.

Note: Primary amine is a compound which contains two hydrogen atoms attached to one nitrogen atom and one alkyl substituent attached with nitrogen atom.