$A \xrightarrow{} (CH_3)_2C=CH-CO-CH_3$. $A$ is:

Preparation of looking mirrors involves the use of

Given below are two statements:
Statement $I$: $2, 6$-diethylcyclohexanone and $6$-methyl-$2$-$n$-propylcyclohexanone are metamers.
Statement $II$: $2, 2, 6, 6$-tetramethylcyclohexanone exhibits keto-enol tautomerism.

Which of the following ketones has the maximum dipole moment?

In the reaction sequence,
the major products $X$ and $Y$ respectively are

$CH_3-CH=CH-CH(OH)-CH_3 \xrightarrow{\text{Jones reagent}} X$,
Product $X$ is