Question

How many structural isomers are possible for butene?

Answer 1

There are three structural isomers of butene.

Explanation:

Isomers with a 4-carbon chain

1. But-1-ene, `"CH"_3"CH"_2"CH=CH"_2`

2. But-2-ene, `"CH"_3"CH=CHCH"_3`

Isomers with a 3-carbon chain

3. 2-Methylpropene, `("CH"_3)_2"C=CH"_2`