In the given reaction sequence,$Y$ is:
Cyclohexanol $\xrightarrow{H^{\oplus}/\Delta} X$ $\xrightarrow[(2) H_2O/Zn]{(1) O_3} Y$

$A$ hydrocarbon '$X$' with formula $C_6H_8$ uses two moles of $H_2$ on catalytic hydrogenation of its one mole. On ozonolysis,'$X$' yields two moles of methane dicarbaldehyde (malonaldehyde). The hydrocarbon '$X$' is :

In the given selective hydrogenation,which combination is incorrect?

Which of the following undergoes reduction (by $H_2|Ni$) at the fastest rate?

The correct statement about the reaction shown above is:

Consider the following reactions:
$X + HCl \xrightarrow{\text{Anhydrous } AlCl_3} C_2H_5Cl$ (Addition)
$Y \xrightarrow{\text{Anhydrous } ZnCl_2 / HCl} C_2H_5Cl$ (Substitution)
$Y$ can be converted to $X$ on heating with $...$ at $...$ temperature: