Which of the following compounds disproportionates into $M_2{O}_2$ (peroxide) and M (metal) on heating?

The correct option is D $N{a}_{2}O$

$N{a}_{2}O$ disproportionates into $M_2{O}_2$ and $M$ is given by,

Reaction:

$2N{a}_{2}O\to N{a}_2{O}_2+2Na$

Hence,option B is cotrrect.