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Question: Answered & Verified by Expert
In the cannizzaro reaction given below
$2 \mathrm{Ph}-\mathrm{CHO} \stackrel{\mathrm{OH}^{-}}{\longrightarrow} \mathrm{Ph}-\mathrm{CH}_{2}-\mathrm{OH}+\mathrm{PhCO}_{2}^{-}$
the slowest step is
ChemistryAldehydes and KetonesVITEEEVITEEE 2015
Options:
  • A the attack of $\overline{\mathrm{O}} \mathrm{H}$ at the carbonyl group
  • B the transfer of hydride ion to the carbonyl group
  • C the abstraction of a proton from the carboxylic acid
  • D the deprotonation of $\mathrm{Ph}-\mathrm{CH}_{2} \mathrm{OH}$
Solution:
2186 Upvotes Verified Answer
The correct answer is: the transfer of hydride ion to the carbonyl group
Hydride ion transfer to the carbonyl group is the slowest or the rate determining step.

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