What is the product formed when a ketone reacts with $Mg-Hg$ in the presence of water?

An organic compound with the molecular formula $C_9H_{10}O$ forms a $2,4-DNP$ derivative,reduces Tollens' reagent,and undergoes the Cannizzaro reaction. On vigorous oxidation,it gives $1,2-benzenedicarboxylic$ acid. Identify the compound.

Consider the above reaction sequence,the Product $'C'$ is

The major product in the following reaction sequence is

In the given compound,how many functional groups are reduced by $LiAlH_4$ (Lithium aluminium hydride) and $NaBH_4$ (Sodium borohydride) respectively? (Assume the compound contains an ester,an acid,a ketone,and an aldehyde group).

Which of the following compounds gives a positive test with $2,4$-$DNP$ ($2$,$4$-dinitrophenylhydrazine)?
$(a)$ Acetone
$(b)$ Butan-$2$-one
$(c)$ Acetaldehyde
$(d)$ Formaldehyde