Which statement/s are true about products P & Q.

In both the cases, initially the corresponding chlorosulphite is formed along with HCl.
Since the medium is weakly polar ether, HCI does not sufficiently ionize to produce chloride ion. For this reasons croryl alcohol (A) is converted into 3-chlorobut-1-bne and (B) is converted into $\mathrm{\gamma }$-substituted chloride. The reaction occurs in a cyclic manner with concomitant migration of the olefinic double bond. The reaction is in fact ${\mathrm{S}}_{{\mathrm{N}}^1}$. The courses of the reactions are shown here.