Which of the following is Lindlar catalyst?

Which of these will not react with acetylene?

Acetylene cannot react with which of the following?

Ethylidene dichloride can be prepared by the reaction of $HCl$ and

Identify $Z$ in the following series of reaction:
$CH_3-CH_2-OH$ $\xrightarrow[170^{\circ} C]{conc. H_2SO_4} X$ $\xrightarrow[CCl_4]{Br_2} Y$ $\xrightarrow[\Delta]{alc. KOH} Z$

An unknown compound $X$ is an unsaturated hydrocarbon. It reacts with $HgSO_4$ and $H_2SO_4$ to give compound $(B)$. Compound $(B)$ on oxidation gives compound $(C)$. Compound $(C)$ on reaction with $NaOH$ and soda lime gives methane. Identify $A$ (which is $X$),$B$,and $C$ by providing the chemical reactions.