Question

the structure below is a __________ amine.

select the correct answer below:

primary (1°)

secondary (2°)

tertiary (3°)

none of the above

Explanation:

Step1: Recall amine classification rules

A primary amine ($1^{\circ}$) has one alkyl group attached to the nitrogen atom. A secondary amine ($2^{\circ}$) has two alkyl groups attached to the nitrogen atom. A tertiary amine ($3^{\circ}$) has three alkyl groups attached to the nitrogen atom.

Step2: Analyze the given structure

In the structure $\mathrm{CH_3 - CH(NH_2)-CH_3}$, the nitrogen atom of the $\mathrm{-NH_2}$ group is attached to one carbon (the $\mathrm{CH}$ carbon which is part of the alkyl group in the context of amine classification). So, it has one alkyl group attached to the nitrogen atom.

Answer:

primary (1°)