Which of the following reactions cannot be used to convert $R_2CO$ to $R_2CH_2$?

Identify the product $Y$ in the following reaction sequence:
$C_6H_6 + CH_3CH_2CH_2Cl$ $\xrightarrow{AlCl_3} X$ $\xrightarrow{KMnO_4} Y$

Some organic compounds possess fragrance and taste. Their names are given in Column-$I$,structures in Column-$II$,and their sources in Column-$III$. Match Column-$I$ with Column-$II$ and Column-$III$.

Column-$I$ (Name)	Column-$II$ (Structure)	Column-$III$ (Source)
$(A)$ Vanillin	$(i)$ $C_6H_4(OH)CHO$ (ortho)	$(p)$ From cinnamon
$(B)$ Salicylaldehyde	$(ii)$ $C_6H_5CH=CHCHO$	$(q)$ From seeds of vanilla
$(C)$ Cinnamaldehyde	$(iii)$ $C_6H_3(OH)(OCH_3)CHO$	$(r)$ From meadow sweet

Which product is formed when the compound $C_6H_5CHO$ is treated with concentrated $KOH$ solution?

An important reaction of acetone is autocondensation in the presence of concentrated sulphuric acid to give the aromatic compound:

Clemmensen reduction involves the conversion of $ >C=O $ to $ >CH_2 $ in the presence of: