Identify the correct reagents that would bring about the following transformation.
(1) (i) \(H_2O/H^+\) (ii) \(CrO_3\)
(2) (i) \(BH_3\) (ii) \(H_2O_2/ \overset {\ominus}{O}H\) (iii) PCC
(3) (i) \(BH_3\) (ii) \(H_2O_2/ \overset {\ominus}{O}H\) (iii) \(alk.KMnO_4\) (iv) \(H_3 O^{\oplus}\)
(4) (i) \(H_2O /H ^+\) (ii) PCC