In a cannizzaro's reaction, the combination not possible is:

H C H O + H C H O

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C H_{3} C H O + H C H O

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O H C - C H O

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C_{6} H_{5} C H O + H C H O

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Solution

The correct option is D $C H_{3} C H O + H C H O$
The Cannizzaro reaction is a chemical reaction that involves the base-induced disproportionation of an aldehyde lacking a hydrogen atom in the alpha position.

acetaldehyde, $C H_{3} C H O$ has 3 acidic hydrogens but in case of formaldehyde, $H C H O$ there is no acidic hydrogen present,

hence formaldehyde undergoes Cannizzaro's reaction whereas acetaldehyde does not.

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A O_{3} / Z n, H_{2} O - ------ \to (C H_{3})_{2} C O + H C H O + C H O | C H O

C H_{3} C H O, H C H O

O H C - C H O

A mixture of $C_{6} H_{5} C H O$ and $H C H O$ is treated with $N a O H$ , then the Cannizzaro’s reaction involves:

C H_{3} C H O

C C l_{3} C H O

C_{6} H_{5} C H O

H C H O

C_{6} H_{5} C H O

C l_{3} C - C H O

(C H_{3})_{3} C - C H O

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