Question

The maximum number of structural isomers of primary amine having the molecular formula $C_5{H}_{11}N{H}_2$ is:

Answer 1

Primary amine can be formed by replacing one $H$ atom with $N{H}_2$ group.

The number of structural isomers possible for pentane is 3, as shown below:

From (i), three primary amines are possible. From (ii), four amines are possible and from (iii), one amine is possible.
Hence, a total of eight structural isomers are possible as shown below: