The most appropriate reaction for the conversion of bromobenzene to benzoic acid is

$\mathrm{X}\underset{\mathrm{ehter}}{\overset{\mathrm{Mg}}{\to }}\mathrm{Y}\underset{{\mathrm{H}}^{+}}{\overset{\mathrm{Dry} {\mathrm{CO}}_2}{\to }}\mathrm{Z}\stackrel{\mathrm{hot} {\mathrm{KMnO}}_4}{\to }\mathrm{P}$

The two isomeric compounds which will give the same tricarboxylic acid after the above sequence of reactions are

Which of the following will be product of following reaction?

In the given reaction sequence.

$\mathrm{Ph}-{\mathrm{CH}}_2-\mathrm{CHO}\stackrel{\mathrm{NaOH}}{⟶}\stackrel{\mathrm{\Delta }}{⟶}\stackrel{{\mathrm{H}}_2/\mathrm{Ni}}{⟶}\left(\mathrm{X}\right)$

Consider following intramolecular aldol condensation reaction.

.

$\mathrm{X}$ can be: