Fusion of `MnO_(2)` along with KOH and `O_(2)` forms X. electrolytic oxidation of X yields Y. X undergoes disproportionation reaction in acidic medium to `MnO_(2)` and Y. The Manganese in X and Y is in the form W and Z respectively, then
A. W & Z are coloured
B. W is diamagnetic and Z is paramagnetic
C. Both W & Z are tetrahedral in shape
D. Both W & Z involve `p pi-dpi` bonding for `pi` bond
