Chemistry - Hydrocarbon Question with Solution | TestHub

In phenol -OH-group is highly ring activating due to strong +R effect so if –COOH- or -$\mathrm{S}{\mathrm{O}}_3\mathrm{H}$- groups are present at ortho and para positions they can be substituted by electrophile like$\mathrm{B}{\mathrm{r}}^{+}$. It is important to use$\mathrm{B}{\mathrm{r}}_2$in water so that$\mathrm{B}{\mathrm{r}}^{+}$can be easily generated in good amount.