Which among the following compounds exhibits +2 oxidation state of oxygen?

Identify substrate $$\mathrm{A}$$ in the following reaction.

$$\mathrm{A}+\mathrm{AgOH} \underset{\mathrm{ii)}~\Delta}{\stackrel{\text { i) moist } \mathrm{Ag}_2 \mathrm{O}}{\longrightarrow}} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{~N}\left(\mathrm{CH}_3\right)_2+\mathrm{CH}_2=\mathrm{CH}_2$$

What volume of $$\mathrm{CO}_{2(\mathrm{~g})}$$ at STP is obtained by complete combustion of $$6 \mathrm{~g}$$ carbon?

Identify the chiral molecule from the following.