Paragraph: A carbonyl compound P , which gives positive iodoform...

Paragraph: A carbonyl compound $P$, which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin $Q$. Ozonolysis of $Q$ leads to a dicarbonyl compound $R$, which undergoes intramolecular aldol reaction to give predominantly $S$. P \underset{$\text{ (ii) } \mathrm{H}^{+}$, $\mathrm{H}_{2} \mathrm{O}$}{\$stackrel{\text{ (i) } \mathrm{MeMgBr}}{\longrightarrow}$} $\mathrm{Q} \underset{\text{ Heat }}{\stackrel{\mathrm{O}_3 / \mathrm{Zn}-\mathrm{H}_2 \mathrm{O}}{\longrightarrow}} \mathrm{P} (iii) \mathrm{H}_{2} \mathrm{SO}_{4} /Heat<strong>Question:</strong> \text{ The structure of the carbonyl compound }$ P $\text{, is }$$