$A$ mixture of $C_2H_6, C_2H_4$ and $C_2H_2$ is bubbled through an alkaline solution of copper$(I)$ chloride,contained in a Woulf's bottle. The gas coming out is

The product of the following hydrogenation reaction is:
$C_6H_6 + H_2 \xrightarrow{\text{Catalyst, High temperature and pressure}} ?$
Given: $1 \text{ eqv. of } C_6H_6$ and $1 \text{ eqv. of } H_2$.

What is the product obtained from the dehydration of glycerol?

The order of appearance of the following with rising temperature during the refining of crude oil is:

An unsaturated hydrocarbon $X$ absorbs two hydrogen molecules on catalytic hydrogenation,and also gives the following reaction: $X$ $\xrightarrow[Zn/H_2O]{O_3} A$ $\xrightarrow{[Ag(NH_3)_2]^{+}} B$ ($3$-oxo-hexane dicarboxylic acid). $X$ will be

Which alkene reacts fastest with $H_2$ under catalytic hydrogenation conditions?