An alkyl halide `(X)`of the folmula `C_(6)H_(13)Cl` on treatment with potassium tertiary butoxide gives two isomeric alkenes `(Y)` and `(Z)(C_(6)H_(12))`. Both the alkenes on hydrogenation give `2,3-`dimethyl butane. Perdict the structures of `(X),(Y)` , and `(Z)`

Answer

`(X) (CH_(3))_(2)CH-underset(CI)underset(|)C(CH_(3))_(2),(y) CH_(3) -underset(CH_(3))underset(|)C=underset(CH_(3))underset(|)C-CH_(3) , (Z) CH_(3)-underset(CH_(3))underset(|)CH-underset(CH_(3))underset(|)C=CH_(2)`