Answer
Five structural isomers of hexane ($C_{6}H_{14}$) are as follows:
Work Step by Step
Draw 6 C in a straight chain and remaining valency of C is filled with H atoms. We get hexane.
Draw 5 C in a straight chain and add a substituent methyl group at C2 position. We get 2-methylpentane.
Draw 5 C in a straight chain and add substituent methyl group at C3 position. We get 3-methylpentane.
Draw 4 C in a straight chain and add two methyl groups at C2 and C3 position respectively. We get 2,3-dimethylbutane.
Draw 4 C in a straight chain and add two methyl groups at C2 position. We get 2,2-dimethylbutane.