Question

Classify each of the following amines as primary$\left(1^{\circ }\right)$ , secondary $\left(2^{\circ }\right)$, or tertiary $\left(3^{\circ }\right)$:

a.

b.

c.

d.

Short answer

(part a) The amine in question is a Primary $\left(1^{\circ }\right)$amine.

(part b) The amine in question is a Secondary$\left(2^{\circ }\right)$amine.

(part c) The amine in question is a Tertiary$\left(3^{\circ }\right)$amine.

(part d) The amine in question is a Tertiary$\left(3^{\circ }\right)$amine.

Step-by-step solution

Introduction.(part  a)

Primary $\left(1^{\circ }\right)$amines are those in which the nitrogen atom is bound to one alkyl group. Secondary $\left(2^{\circ }\right)$amines with two alkyl groups bound to the nitrogen atom. Tertiary $\left(3^{\circ }\right)$ amines with three alkyl groups bound to the nitrogen atom.

Given Information (part a).

To find the amines are primary, secondary or tertiary.

Explanation (part a).

${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{NH}}_2$

It's categorized as a Primary $\left(1^{\circ }\right)$amine. One propyl group is confined to one nitrogen atom in this structure.

Given Information (part b).

To find the amines are primary, secondary or tertiary.

Explanation (part b).

It's categorized as a Secondary $\left(2^{\circ }\right)$ amine. The nitrogen atom is bound to one propyl group and one methyl group in this structure.

Given Information (part c).

To find the amines are primary, secondary or tertiary.

Explanation (part c).

It's categorized as a tertiary $\left(3^{\circ }\right)$amine. In this structure the nitrogen atom is bounded to three alkyl groups.

Given Information (part d).

To find the amines are primary, secondary or tertiary.

Explanation (part d).

It's categorized as a tertiary $\left(3^{\circ }\right)$amine. The nitrogen atom is bound to two ethyl groups and one methyl group in this structure.