Write the formulas and names of the alkenes which on hydrogenation form 2-methylpentane.

Explanation

The carbon skeleton of the probable alkenes is
`C-overset(overset(C)(|))(C) - C- C-C`
As there are foure different positions of the double bond in the given carbon skeleton, four alkenes are possible which form 2-methylpentane on hydrogenation. The probable alkenes are:
`underset("2-methylpent-1-ene")(CH_(2) = overset(overset(CH_(3))(|))(C)CH_(2) CH_(2)CH_(3))" " underset("2-methylpent-2-ene")(CH_(3) - overset(overset(CH_(3))(|))(C) = CHCH_(2)CH_(3))`
`underset("4-methylpenet-2-ene")(CH_(3)-overset(overset(CH_(3))(|))(C)H- CH = CHCH_(3))" " underset("4-methylpent-1-ene")(CH_(3)- overset(overset(CH_(3))(|))(C)H - CH_(2) - CH = CH_(2))`