Urea upon hydrolysis yields

Which one of the following is the molecular formula of a tertiary amine?

The following compounds can be classified as $N,N$-dimethylpropan$-1-$amine,$N$-methylaniline,and aniline,respectively. Identify their classification as primary,secondary,or tertiary amines.

How many primary amines are possible for the molecular formula $C_3H_9N$?

Which of the following compounds is an example of a primary amine?

How many methyl groups are present in $n-hexadecyl$ trimethyl ammonium chloride?