In the given reaction scheme, P is a phenyl alkyl ether, Q is an aromatic compound; R and  S are the major products.  
$$\begin{gathered} \mathrm{P}\stackrel{\mathrm{HI}}{\to }\mathrm{Q}\underset{\left(\mathrm{iii}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right) \mathrm{NaOH} \\ \left(\mathrm{ii}\right) {\mathrm{CO}}_2}{\to }}\mathrm{R}\underset{\text{ (ii) }{\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\text{ (i) }{\left({\mathrm{CH}}_3\mathrm{CO}\right)}_2\mathrm{O}}{\to }}\mathrm{S} \end{gathered}$$
The correct statement about  S is