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In the Cannizzaro reaction given below: ...

In the Cannizzaro reaction given below:
`2Ph-CHO overset(overset(Θ)OH)rarrPh-CH_(2)OH+PhCO_(2)^(-)` the slowest step is:

A

The attack of `OH^(-)` at the carbonly group.

B

The transfer of hydride to carbonly group

C

The abstraction of proton from the carboxylic group

D

Deprotonation of ph. `CH_(2)OH`

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