Question

Which one of the following is not a primary amine?

• A. tert-Butylamine
• B. Ethylamine
• C. sec-Butylamine
• D. iso-Butylamine
• E. Dimethylamine

Answer 1

Answer: (E)

Dimethylamine $\left[{\left(C{H}_3\right)}_{2}NH\right]$ 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.