In the reaction $CH_3CH_2CH_2Br$ $\xrightarrow{aq. NaOH} (X)$ $\xrightarrow{Al_2O_3, \text{Heat}} (Y)$ $\xrightarrow{HOCl} (Z)$,what is $Z$?

$HO - CH_2 - CH_2 - CH_2 - CH_2 - CH = CH_2 \xrightarrow{Br_2} \text{Product ?}$

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A :$ Treatment of bromine water with propene yields $1-$bromopropan$-2-$ol.
Reason $R:$ Attack of water on bromonium ion follows Markovnikov rule and results in $1-$bromopropan$-2-$ol.
In the light of the above statements,choose the most appropriate answer from the options given below:

The percentage composition of an organic compound $A$ is: carbon = $85.71 \%$ and hydrogen = $14.29 \%$. Its vapour density is $14$. Consider the following reaction sequence:
$A$ $\xrightarrow{Cl_2/H_2O} B$ $\xrightarrow[(ii) H_3O^+]{(i) KCN/EtOH} C$
Identify $C$.

The major product formed during the reaction of $1$-methylcyclopentene with $CH_3CO_3H$ is

Which of the following reactions occurs easily in ethylene?