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Q. In Cannizzaro reaction $RDS$ involves:

NTA AbhyasNTA Abhyas 2022

Solution:

Cannizaro reaction takes place when alpha hydrogen is not present with carbonyl compounds and at least one hydrogen should be present which is directly connect do carbonyl group and it behaves as hydride donor as shown below (this breaking of hydrogen and behaving its as hydride is the slowest step of the reaction):
Example:
Solution