(a and b)
Primary amines :
(i)

CH3CH2CH2CH2NH2

Butanamine

(ii)

CH3CH2− C | NH3 H−CH3

Butan−2−amine

(iii)

CH3− CH3 | C | CH3 −NH2

2−Methylpropan−2−amine

(iv)

CH3− CH3 | C H−CH2−NH2

2−Methylpropan−1−amine

(v)

CH3CH2−NH−CH2CH3

N−Ethylethanamine

(vi)

CH3CH2CH2−NH−CH3

N−Methylpropanamine

(vii)

CH3− CH3 | C H−NH−CH3

N−Methylpropan−2−amine

Tertiary amine:
(viii)

CH3− CH3 | N −CH2CH3

N,N−Dimethylethanamine

(c) Chain isomers : (i) & (iv), (ii) & (iii), (i) & (iii), (ii) & (iv)
Position isomers : (i) & (ii), (vi) & (vii)
Metamers : (v) & (vi), (v) & (vii)
Functional isomers: All primary amines are functional isomers of secondary and tertiary amines and vice versa.