Aldehydes, Ketones and Carboxylic Acids

Compounds P and R upon ozonolysis produce Q and S, respectively. The molecular formula of Q and S is C8H8O.Q Cannizzaro reaction but not haloform reaction, whereas S undergoes haloform reaction but not Cannizzaro reaction.
(i) P

i)‌O3‌/‌C‌H2‌C‌l2

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ii)‌Z‌n‌/‌H2‌O

Q

(C8H8O)

(ii) R

i)‌O3‌/‌C‌H2‌C‌l2

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ii)‌Z‌n‌/‌H2‌O

Q

(C8H8O)

The option(s) with suitable combination of P and R, respectively, is(are)