Identify $\text{'}\mathrm{Z}\text{'}$ in the following reaction series,

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br}\stackrel{\mathrm{aq}.\mathrm{NaOH}}{\to },\left(\mathrm{X}\right)\underset{\mathrm{Heat}}{\overset{{\mathrm{Al}}_2{\mathrm{O}}_3}{\to }}\left(\mathrm{Y}\right)\stackrel{{\mathrm{Cl}}_2/{\mathrm{H}}_2\mathrm{O}}{⟶}\left(\mathrm{Z}\right)$
 

Arrange the following compound in increasing order of reactivity towards aromatic nucleophilic substitution reaction.

The addition of $\mathrm{HBr}$ to $1$ -Butene gives a mixture of products $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$.

(C) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Br}$

What are major and minor products?

Which of the following statement is correct for ${\mathrm{SN}}^2$ mechanism?

What is the type of following reaction?