Write the structural formula of
(i) 3-oxopentanal,
(ii) 1-Phenylpentan-1-one
(iii) p-Methylbenzaldehyde,
(iv).

Explanation

(i). `underset("3-Oxopentanal")(overset(5)(C)H_(3)overset(4)(C)H_(2)-overset(O)overset(3||)(C)-overset(2)(C)H_(2)-overset(1)(C)HO)`
(ii) `underset("1-Phenylpentan-1-one")(C_(6)H_(5)-overset(O)overset(1||)(C)-overset(2)(C)H_(2)overset(3)(C)H_(2)overset(4)(C)H_(2)overset(4)(C)H_(2)overset(5)(C)H_(3))`
(iii). .