Write structures of all the alkenes which on hydrogenation give 2-methylbutane.

Explanation

The basic skeleton of 2-methylbutane is `overset1Coverset2-oversetoversetC|C overset3-C overset4-C`
Putting double bond at various different positions and satisfying the tetracovalency of each carbon, the structures of various alkenes which give 2-methylbutane on hydrogenations are :
`underset"3-Methylbut-1-ene"(overset4CH_3-.^(3)oversetoverset(CH_3)|CH-overset2CH=overset1CH_2)`
`underset"2-Methylbut-2-ene"(overset1CH_3-.^(2)oversetoverset(CH_3)|C-.^(3)CH-overset4CH_3)`
`underset"2-Methylbut-1-ene"(overset1CH=.^(2)oversetoverset(CH_3)|C-overset(3)CH_2overset4CH_3)`