Suggest the mechanism whether ${\mathrm{S}}_{\mathrm{N}}1$ or ${\mathrm{S}}_{\mathrm{N}}2$ in the following reactions:

$({\mathrm{CH}}_3{)}_3{\mathrm{CCH}}_2\mathrm{Br} \stackrel{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{O}}{\to } ({\mathrm{CH}}_3{)}_3{\mathrm{CCH}}_2{\mathrm{OC}}_2{\mathrm{H}}_5$

Suggest the mechanism whether ${\mathrm{S}}_{\mathrm{N}}1$ or ${\mathrm{S}}_{\mathrm{N}}2$ in the following reactions:

The reaction is:

The product obtained will be:

What is the product of the following ${\mathrm{S}}_{\mathrm{N}}2$ reaction?

The mechanism of ${\mathrm{S}}_{\mathrm{N}}1$ reaction is following the sequence

The statement about sequence on the basis of assumption that $\mathrm{R}$ contains $3$ different groups is:

Which is the correct reaction coordinate diagram for the following solvolysis reaction?