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

In the following reaction sequence, the correct structure of E, F and G are :

In the following reaction sequence, products I, J and L are formed. K represents a reagent.

The structure of the product I is :

In the following reaction sequence, products I, J and L are formed. K represents a reagent.

The structure of compounds J and K, respectively, are: