Question

Which of the following have $1^o$ amine group?

• A. $C{H}_{3}C{H}_2-N{H}_2$
• B.
• C.
• D. All of these

Answer 1

The correct option is D All of these

The amine group is $-N{H}_2$.
When amine group has two hydrogen ($-N{H}_2$) then it is called primary amine.
When its hydrogen are replace by methy group or any other alkyl group they are called secondary or tertiary amine
$-NHR$ is called secondary amine group
$-N{R}_2$ is called tertiary amine group
In all the given molecule we have only $-N{H}_2$.
Thus all the molecules have primary amine group.