(i) C3H8,
(ii) C4H10,
(iii) C5H12,
(iv) C6H14,
(ii) C4H10: Butane has two isomers-n-butane and iso-butane.
(iii) C5H12: Pentane has thee isomers. Isomers of pentane (C5H12):
(iv) C6H14: Hexane (C6H14) has five isomers. The isomers of hexane (C6H14) are: