Correct option is (a)
When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are) potassium meta chloro benzoate and meta chloro benzyl alcohol.
In this reaction, there is no alpha hydrogen atom present in meta chloro benzaldehyde.
Hence it undergoes cannizzaro reaction in which one molecule is oxidized to meta chloro benzoic acid and other molecule is reduced to meta chloro benzyl alcohol.
