Compound (P) is :

When an oxide of manganese (P) is fused with KOH in the presence of an oxidising agent and dissolved in water, it gives a dark green solution of compound (Q). Compound (Q) disproportionates in neutral or acidic solution to give purple compound ( R) oxidises potassium iodide solution to a compound (S) and compound (P) is also formed. Compounds P to S are

Compound (P) forms a precipitate with AgNO_(3) . The precipitate dissolves in excess reagent (P). (P) cannot be:

Compound (P) forms a precipitate with AgNO_(3) . The precipitate dissolves in excess reagent (P). (P) cannot be:

Compound P will be

Compound P will be

Predict the compound (P) on the basis of above sequence of the reactions? Where compound (P) gives positive Iodoform test.