Question

$Ph-CHO+HCHO\underset{△}{\overset{conc.KOH}{\to }}\left(C\right)+\left(D\right)$
Product (C) & (D) are :

• A. $PhC{O}_{2}H,PhOH$
• B. $PhC{O}_2^{-},HC{O}_2^{-}$
• C. $PhC{H}_{2}OH,HC{O}_2^{-}$
• D. $PhC{O}_2^{-},C{H}_{3}OH$

Answer 1

The correct option is C $PhC{H}_{2}OH,HC{O}_2^{-}$

Cannizzaro reaction is a chemical reaction named after Stanislao Cannizzaro that involves the base-induced disproportionation of two molecules of a non-enolizable aldehyde to yield a carboxylic acid and a primary alcohol. If we have 2 different aldehydes in the Cannizzaro reaction​, it is known as Cross-Cannizzaro reaction​.

Compound which is more reactive towards nucleophilic addition reaction, undergoes oxidation and other one undergoes reduction.

In the Cross-Cannizzaro reaction of benzaldehyde and formaldehyde, benzaldehyde is reduced to benzyl alcohols as this is less reactive than formaldehyde. Formaldehyde is oxidised to formic acid. The reaction is as follows: