Question

The structure given below represents:

• A. Quarternary ammonium salt
• B. Primary amine
• C. Secondary amine
• D. Tertiary amine

Answer 1

The correct option is B Primary amine

Primary amine results when only one hydrogen atom of ammonia $\left(N{H}_3\right)$ is replaced by the alkyl group. Primary amine has $-N{H}_2$ group attached with alkyl substituent.
Given structure is of tertiary butyl amine.
Note: It does not matter what kind of alkyl group is attached with amino group. To classify as primary/secondary/tertiary, we have to count the number of replaced hydrogens from ammonia.
$1H\text{replaced}\to 1^o\text{amine}$
$2H\text{replaced}\to 2^o\text{amine}$
$3H\text{replaced}\to 3^o\text{amine}$