Work out all possible structural isomeric alkenes corresponding to `C_(5)H_(10)` and also give their `IUPAC` names.
Strategy: Alkene isomers are deduced by writing the different `C` skeletons and then introducing the double bond at different locations. The possible skeletons are
`C-C-underset((I))C-C-C,C-underset((II))underset(C)underset(|)C-C-C,C-underset((III))underset(C )underset(|)overset(C )overset(|)C-C`

Explanation

(a) `underset("Pent-1-ene")(CH_(2)=CH-CH_(2)-CH_(2)-CH_(3)`
(b) `underset("Pent-2-ene")(CH_(3)-CH=CH-CH_(2)-CH_(3)`
(c ) `underset("2-Methylbut-2-ene")(CH_(3)-underset(CH_(3))underset(|)C=CH-CH_(3)`
(d) `underset("3-Methylbut-1-ene")(CH_(3)-underset(CH_(3))underset(|)"CH"-CH=CH_(2)`
(e) `underset("2-Methylbut-1-ene")(CH_(2)=underset(CH_(3))underset(|)"C"-CH_(2)-CH_(3)`