Multiple choice

Which of the following compounds will undergo Cannizzaro reaction? P. (CH3)3C-CHO Q. C6H5CHO R. C6H5CH2CHO S. CH3CH2CHO

  1. Only P and Q

  2. Only P and R

  3. Only Q and R

  4. Only Q and S

  5. Only R and S
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A Correct answer
Explanation

Aldehydes having no alpha hydrogen, when heated with conc. alkali, undergo self-oxidation-reduction to yield a mixture of corresponding alcohol and carboxylate salt. This reaction is known as Cannizzaro reaction. Since (CH3)3C-CHO and C6H5CHO do not have alpha hydrogen, they will undergo Cannizzaro reaction.

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