Question

Which of the following is not a primary amine?

• A. tert - Butylamine
• B. sec - Butylamine
• C. Isobutylamine
• D. Dimethylamine

Answer 1

Answer: (D)

Dimethylamine

Dimethylamine $\left[\right(C{H}_3{)}_{2}NH]$ is a secondary amine as the central Nitrogen atom is substituted by two methyl groups and the nitrogen has one hydrogen. Tert-butyl amine, secondary butyl amine, isobutylamine are all the isomers of n-butyl amine, varying in the position of the $N-$group in the alkyl chain.