The Clemmensen reduction of acetone yields

Select the best reagent to carry out the above conversion.

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

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.

Identify the major product of the following reaction:

Which of the following reactions does not represent the aldol condensation reaction?