An organic compound (X), ${\mathrm{C}}_7{\mathrm{H}}_8\mathrm{O}$ , is insoluble in both $\mathrm{N}\mathrm{a}\mathrm{H}\mathrm{C}{\mathrm{O}}_3$ and NaOH. On treatment with bromine-water (X) rapidly forms compound of molecular formula, ${\mathrm{C}}_7{\mathrm{H}}_5\mathrm{O}\mathrm{B}{\mathrm{r}}_3$ . The compound (X) is

The major product $\left[\mathrm{B}\right]$ in the following reaction is :

The major aromatic product $\mathrm{C}$ in the following reaction sequence will be :

What are the products formed in the following reaction?

What is $\mathrm{X}$ in the following change?