What is the reduction of aldehydes and ketones in the presence of zinc amalgam and concentrated $HCl$ called?

Which of the following reagents converts phenyl methyl ketone into ethylbenzene?

The product formed by the reaction of chlorine with benzaldehyde in the absence of a catalyst is

Consider the following reaction,where:
$(A)$ The change in the functional group and
$(B)$ The corresponding change in the hybridization from the starting material to the final product are:
$CH_3-C \equiv N \xrightarrow[(ii) \ HI + \text{Red } P]{(i) \ SnCl_2, HCl / H_3O^{+}}$

The end product $(C)$ in the following sequence of reactions is:
$HC \equiv CH$ $\xrightarrow[20\% \ H_2SO_4]{1\% \ HgSO_4} A$ $\xrightarrow[H_2O]{CH_3MgX} B$ $\xrightarrow{[O]} (C)$

The major product of the following reaction is