Reaction of iso-propylbenzene with $\mathrm{O}_{2}$ followed by the treatment with $\mathrm{H}_{3} \

Question

Reaction of iso-propylbenzene with $\mathrm{O}_{2}$ followed by the treatment with $\mathrm{H}_{3} \mathrm{O}^{+}$forms phenol and a by-product $P$. Reaction of $P$ with 3 equivalents of $\mathrm{Cl}_{2}$ gives compound $Q$. Treatment of $Q$ with $\mathrm{Ca}(\mathrm{OH})_{2}$ produces compound $R$ and calcium salt $S$.\ The correct statement(s) regarding $P, Q, R$ and $S$ is(are)\

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(a, b, d)