Question

How do you write a structural formula for the compound 2-ethyl-1-butene?

Answer 1

`H_2C=C(CH_2CH_3)CH_2CH_3`

Explanation:

`"1-butylene"` `=` `H_2C=CHCH_2CH_3`, a four carbon chain.

At `C2` we replace the hydrogen for an ethyl group, to give:

`H_2C=C(CH_2CH_3)CH_2CH_3`