Complete the following reactions:
(i) `CH_(3)-overset(CH_(3))overset(|)underset(Cl)underset(|)C-CH_(2)CH_(3) overset("alc"KOH) underset(Delta) to A overset(O_(3))underset(Zn//H_(2)O) to (B+C)`
(ii) `CH_(3)overset(I)CH-CH_(3)overset("alc"KCN) to A underset((ii)H_(2)O.OH.H_(2)O_(2))overset((i)SnCl_(2)//HCl) to B`
(iii) `HCN overset(HCl//AlCl_(3)) to A underset((ii) (H_(2)O)//H^(-))overset((i)C_(6)H_(6)Delta) to B`
(iv)

Answer

`CH_(3)-underset(CH_(3))underset(|)C=CH-CH_(3)`