Hydrocarbons: JEE Main 2025 Chemistry question

A molecule ("P") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonolysis followed by reflux under alkaline condition gives ("R"). The structure of ("R") is given below. [R: 1-acetyl-2-methylcyclopent-1-ene, i.e. a cyclopentene ring carrying $\mathrm{COCH_3}$ and $\mathrm{CH_3}$ on the two alkene carbons] The structure of ("P") is