Which of the following has the smell of bitter almonds?

$CH_2=CH-CH_2-NH-CH_3$ is a

What is the $IUPAC$ name of $CH_3CH_2NHCHO$?

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

The $IUPAC$ names of the following compounds $A$ and $B$ are:

What is the number of primary amine molecules among the following compounds?
$(CH_3)_3N, (CH_3)_2NH, CH_3-NH_2, CH_3-CH(NH_2)-CH_3, C_6H_5NH_2, C_6H_5NHCH_3, (CH_3)_3C-NH_2$