Which of the following is an alkaloid?

The total number of electrons in the amide group $-CONH_2$ is:

In the reaction $R - C(=O) - OH \xleftarrow{H_3O^{+}} X \xrightarrow{[H]} RCH_2NH_2$; '$X$' is

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

The $IUPAC$ name of $CH_3-CH_2-CH(NH_2)-CH_3$ is:

Which of the following has the smell of bitter almonds?