How will you convert butan -2-one to propanoic acid?

Options

A. Tollen's reagent
B. Fehling solution
C. `NaOH//I_(2)//H^(+)`
D. `NaOH//NaI//H^(+)`

Answer

C

Explanation

Tollen's reagent, Fehling solution and `NaOH//NaI//H^(+)` are not able to change butan-2-one (ketone) into propanoic acid because these are mild oxidising agents, so `NaOH//I_(2)` firstly form iodoform along with `C_(2)H_(5)COONa` with butan-2-one (ethyl methyl ketone). In these `C_(2)H_(5)COONa` reacts with aci `(H^(+))` to give `C_(2)H_(5)COOH` (propanoic acid).
`{:(underset(("ethyl methyl ketone"))underset("butan-2-one")(CH_(3)-overset(O)overset(||)(C)-CH_(2))-CH_(3)+3I_(2)+4NaOHrarr),(" "underset("iodoform")(CHI_(3)darr)+C_(2)H_(5)COONa+3NaI+3H_(2)O),(" "C_(2)H_(5)COONa+H^(+)rarr underset("propanoic acid")(C_(2)H_(5)COOH+)Na^(+)):}`