Given the products in each of the following reactions :
(i) `H_(3)C - CH_(2) - overset(O)overset(||)(C) - CH_(3) overset(C_(6)H_(5)-CO_(3)H)to , underset(H^(+))overset(C_(2)H_(5)Ona)to`
(ii) `H_(3)C - CHO overset(C_(6)H_(5)-CO_(3)H)to underset(H^(+))overset(CH_(3) - CH_(2)ONa)to `
(iii) `H_(3)C - C -= CH overset(HgSO_(4)//H_(2)SO_(4))to , overset(C_(6)H_(5)-CO_(3)H)to underset(H^(+))overset(CH_(3)ONa)to`

Explanation

`H_(3)C - CH_(2) - overset(O)overset(||)(C) - CH_(3) underset("Bayer Villiger oxidation")overset(C_(6)H_(5) - CO_(3)H)to H_(3)C - overset(O)overset(||)(C)-OCH_(2) - CH_(3)`
` underset("Claisen condensation")overset(C_(2)H_(5)ONa//H^(+))to H_(2)C - overset(O)overset(||)(C) - CH_(2) - overset(O)overset(||)(C) - OCH_(2) - CH_(3)`
(ii) `OHCH_(3)C_(2) -CHO underset("Tischenko")overset(Al(OC_(2)H_(5))_(3))to H_(3)C - overset(O)overset(||)(C)- OCH_(2) - CH_(3)`
` underset("Claisen condensation")overset(C_(2)H_(5)ONa//H^(+))to H_(3)C - overset(O) overset(||)overset(C) - CH_(2) -overset(O)overset(||)(C)- OCH_(2) - CH_(3)`
(iii) `H_(3)C- C -= CH overset(HgSO_(4)//H_(3)O^(+))to H_(3)C - overset(O)overset(||)(C) - CH_(3) overset(C_(6)H_(5) - CO_(3)H) to H_(3)C- overset(O)overset(||)(C)-O - CH_(3)`
`underset("Claisen condensation")overset(CH_(3) ONa//H^(+))to H_(3)C - overset (O)overset(||)(C) - CH_(2) - overset(O)overset(||)(C) - CH_(3)`