$(i)$ Write structures of different isomeric amines corresponding to the molecular formula,$C_{4}H_{11}N$. $(ii)$ Write $IUPAC$ names of all the isomers. $(iii)$ What type of isomerism is exhibited by different pairs of amines?

(A) $(i), (ii)$ The structures and their $IUPAC$ names of different isomeric amines corresponding to the molecular formula,$C_{4}H_{11}N$ are:
$(a)$ $CH_{3}CH_{2}CH_{2}CH_{2}NH_{2}$: $\text{Butan-1-amine } (1^{\circ})$
$(b)$ $CH_{3}CH_{2}CH(NH_{2})CH_{3}$: $\text{Butan-2-amine } (1^{\circ})$
$(c)$ $(CH_{3})_{2}CHCH_{2}NH_{2}$: $\text{2-Methylpropan-1-amine } (1^{\circ})$
$(d)$ $(CH_{3})_{3}CNH_{2}$: $\text{2-Methylpropan-2-amine } (1^{\circ})$
$(e)$ $CH_{3}CH_{2}CH_{2}NHCH_{3}$: $\text{N-Methylpropan-1-amine } (2^{\circ})$
$(f)$ $CH_{3}CH_{2}NHCH_{2}CH_{3}$: $\text{N-Ethylethanamine } (2^{\circ})$
$(g)$ $CH_{3}CH(CH_{3})NHCH_{3}$: $\text{N-Methylpropan-2-amine } (2^{\circ})$
$(h)$ $CH_{3}CH_{2}N(CH_{3})_{2}$: $\text{N,N-Dimethylethanamine } (3^{\circ})$
$(iii)$ The pairs $(a)$ and $(b)$,and $(e)$ and $(g)$ exhibit position isomerism.
The pairs $(a)$ and $(c)$,$(a)$ and $(d)$,$(b)$ and $(c)$,and $(b)$ and $(d)$ exhibit chain isomerism.
The pairs $(e)$ and $(f)$,and $(f)$ and $(g)$ exhibit metamerism.
Primary,secondary,and tertiary amines exhibit functional isomerism with each other.