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

Options

A. The attack of OH at the carbonyl group
B. The transfer of hydride to the carbonyl group
C. The abstraction of proton from the carboxylic group
D. The deprotonation of `Ph-CH_(2)OH`

Answer

B

Explanation

In the Cannizaro's reaction given below
`2Ph-CHO overset(-OH)rarr Ph-CH_(2)OH+PhCOO^(-)`
The slowest step is transfer of hydride ion to the carbonyl group of second mole of aldehyde. Hence it is represented in following reaction mechanism.