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JEE Advanced2009ChemistryAldehydes and KetonesActual

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 (ii) H ⁺, H ₂ O (i) MeMgBr Q Heat O ₃ / Zn - H ₂ O P (iii) H ₂ SO ₄ /Heat Question: The structure of the product S , is

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