What type of phenomenon does the Cannizzaro reaction exhibit?

What sorts of information can you draw from the following reaction?
$(CN)_{2}(g) + 2OH^{-}(aq) \rightarrow CN^{-}(aq) + CNO^{-}(aq) + H_{2}O(l)$

Auto-oxidation of bleaching powder gives

$3ClO^- \to ClO_3^- + 2Cl^-$; This reaction is an example of which of the following?

Disproportionation of $1 \ mol$ of $MnO_4^{2-}$ in neutral aqueous solution results in which of the following?

In the following reaction,assign the state for the underlined atom in the products of complete hydrolysis at $R.T.$: $\underline{N}_2O_4 + H_2O \longrightarrow HNO_3 + HNO_2$