Isobutylene is obtained when

Consider the following ${\mathrm{E}}_1/{\mathrm{S}}_{\mathrm{N}}1$ reaction:

The missing product (s) is (are):

Which of the following structures are possible products?

What are the possible intermediates of the following reaction which form during this reaction path way?

An aromatic compound $\mathrm{X}$ has the molecular formula as ${\mathrm{C}}_7{\mathrm{H}}_8\mathrm{O}$. It has $4$ isomers (excluding $\mathrm{X}$). $\mathrm{X}$ does not give ${\mathrm{H}}_2$ gas with $\mathrm{Na}$ metal.

$\mathrm{Y}$ does not give neutral ${\mathrm{FeCl}}_3$ test but liberates ${\mathrm{H}}_2$ gas with $\mathrm{Na}$-metal.

What are $\mathrm{X} \text{and} \mathrm{Y}$?

An aromatic compound 'X' having molecular formula ${\mathrm{C}}_7{\mathrm{H}}_8\mathrm{O}.$ It has 4 isomers (excluding X ). 'X' does not give ${\mathrm{H}}_2$ gas with $\mathrm{Na}$ metal

$\mathrm{Z}$ gives neutral ${\mathrm{FeCl}}_3$ test and on further mono-bromination on benzene ring it can form two products. Identify $\mathrm{X} \mathrm{and} \mathrm{Z}$.

Choose the reaction in each of the following pairs that proceeds at the faster rate. Explain your reasoning:

Base-promoted hydrolysis of phenyl acetate or $\mathrm{m}$-nitrophenyl acetate.