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8.1. Aldehydes and ketones — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry8.1. Aldehydes and ketones1 Mark
MCQ
In Cannizzaro reaction given below

$2PhCHO \xrightarrow{{:\mathop O\limits^ \ominus  H}}PhC{H_2}OH + PhC\mathop {O_2^ \ominus }\limits^{.\,\,.\,\,} $

the slowest step is :

  • ✓
    the transfer of hydride to the carbonyl group
  • B
    the abstraction of proton from the carboxylic group
  • C
    the deprotonation of $Ph CH_2OH$
  • D
    the attack of ${:\mathop O\limits^ \ominus  H}$ at the carboxyl group
✓

Answer

Correct option: A.
the transfer of hydride to the carbonyl group
a
Hydride ion transfer to the carbonyl group is the slowest or the rate determining step.

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