Mechanism of Cannizzaros reaction of benzaldehyde is

Which of the following cannot undergo intramolecular Cannizaro's reaction?

H - O | | C - O | | C - H

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H - O | | C - O | | C - P h

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P h - O | | C - O | | C - P h

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P h_{2} - O | | C - O | | C - H

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Solution

The correct option is C $P h - O | | C - O | | C - P h$
The only aldehyde which does not contain $α$ -hydrogen undergoes Cannizzaro reaction ketones do not undergo Cannizzaro reaction.
$∴$ Refer to the image
Diketone does not undergo intra molecular Cannizzaro reaction.
$P h - O | | C - O | | C - P h$

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1

M

N a H C O_{3}

H_{2} C O_{3} + H_{2} O ⇌ H C O_{3}^{-} + H_{3} O^{+};

p K_{1} = 6.38

H C O_{3}^{-} + H_{2} O ⇌ C O_{3}^{2 -} + H_{3} O^{+};

p K_{2} = 10.26

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