Which of the following statements about the reactions of chlorine with sodium hydroxide are correct?

ABoth reactions are disproportionation reactions.
BWith cold dilute NaOH, chlorine is converted to oxidation states $- 1$ and $+ 1$ .
CIn both reactions chlorine acts only as an oxidising agent.
DWith hot concentrated NaOH, chlorine is converted to oxidation states $- 1$ and $+ 5$ .

Answer: A, B, D

Cold dilute:

Cl X_{2} Cl X^{-} + OCl X^{-}

(0 to -1 and +1). Hot concentrated:

Cl X_{2} Cl X^{-} + ClO X_{3} X^{-}

(0 to -1 and +5). In each case the same element is both oxidised and reduced, so chlorine is both oxidant and reductant, not only an oxidising agent.