Question

how many structural isomers can you draw for pentane

Answer 1

Pentane (C5H12) has three structural isomers.
1. n-pentane: It is the straight chain. It is also the normal structure of pentane.
2. 2-methyl butane: It is a branched chain with a carbon atoms.
3. 2,2-dimethyl propane: It is also known as neopentane. It is a double branched chain alkane with five carbon atoms. 

Hope it helps. Thank you. ☺♥

Answer 2

$\green{Hope\:It\:Helps\:You}$

${\huge{\mathtt{\pink{Thank\:You}}}}$