Level 3

In which alkyl halide, ${\mathrm{S}}_{\mathrm{N}}2$ mechanism is favoured maximum?

In which of the following reactions can regioselectivity be observed?

If 

what will be the major product of the following reaction

 major product.

The order of ${\mathrm{S}}_{\mathrm{N}}1$ reactivity in aqueous acetic acid solution for the compounds is:

$1$.

$2$. ${\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Cl}$

$3$. ${\left({\mathrm{H}}_3\mathrm{C}\right)}_3\mathrm{C}-\mathrm{Cl}$ 

In electrophilic aromatic substitution reactions of chlorobenzene, the ortho/para-directing ability of chlorine is due to its:

In the reaction, $\mathrm{A}\stackrel{\mathrm{KCN}}{⟶}\mathrm{B}\stackrel{{\mathrm{LiAlH}}_4}{⟶}{\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{NH}}_2$

$\mathrm{R}-\mathrm{Cl}+\mathrm{AgCN}\to \mathrm{A}\stackrel{ \mathrm{Reduction}}{⟶}\mathrm{B}$

$\mathrm{A}$ and $\mathrm{B}$, respectively are

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}\stackrel{\mathrm{NaCN}}{⟶}\mathrm{X}\stackrel{\mathrm{Ni}/{\mathrm{H}}_2}{⟶}\mathrm{Y}\underset{ \mathrm{anhydride} }{\overset{ \mathrm{Acetic}}{\to }}\mathrm{Z}$, $\mathrm{Z}$ in the above reaction sequence is: