The structure shown in the figure is best classified as a(an):

Which of the following reagents can be used to reduce the $ > C = O$ group to $CH_2$?

In the presence of dil. $HCl$,compound $A$ is converted to a constitutional isomer $(B)$. Compound $B$ is:

Given below are two statements,one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: $3$-chloro-$2$-methylpentan-$3$-one can be subjected to Wolff-Kishner reduction to give $3$-chloro-$2$-methylpentane.
Reason $R$: Wolff-Kishner reduction is used to convert $C=O$ into $CH_2$.

In the given reaction: $C_6H_5-COCH_3 \xrightarrow[(ii) H^{+}]{(i) Br_2/KOH} CHBr_3 + [X]$,$[X]$ will be:

The reaction sequence is: $P$ $\xrightarrow{\Delta } X$ $\xrightarrow[{HCl}]{{Zn-Hg}} Y$. Here,$P$ is $2-$oxocyclohexanecarboxylic acid. Identify $Y$.