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.

The structure of the carbonyl compound P is
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.

The structures of the products Q and R, respectively, are
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.

The structure of the product S is
Match each of the diatomic molecules in Column I with its property/properties in Column II:
| Column I | Column II | ||
|---|---|---|---|
| (A) | $${B_2}$$ | (P) | Paramagnetic |
| (B) | $${N_2}$$ | (Q) | Undergoes oxidation |
| (C) | $$O_2^ - $$ | (R) | Undergoes reduction |
| (D) | $${O_2}$$ | (S) | Bond order $$\ge$$ 2 |
| (T) | Mixing of $$s$$ and $$p$$ orbitals |
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