KCET · Chemistry · Aldehydes and Ketones

The correct sequence of steps involved in the mechanism of Cannizaro's reaction is

A nucleophilic attack, transfer of \(\mathrm{H}^{-}\)and transfer of \(\mathrm{H}^{+}\)
B transfer of \(\mathrm{H}^{-}\), transfer of \(\mathrm{H}^{+}\)and nucleophilic attack
C transfer if \(\mathrm{H}^{+}\), nucleophilic attack and transfer of \(\mathrm{H}^{-}\)
D electrophilic attack by \(\mathrm{OH}^{-}\), transfer of \(\mathrm{H}^{+}\)and transfer of \(\mathrm{H}^{-}\)

Verified Solution

Answer & Solution

Correct Answer

(A) nucleophilic attack, transfer of \(\mathrm{H}^{-}\)and transfer of \(\mathrm{H}^{+}\)

Step-by-step Solution

Detailed explanation

The Cannizaro reaction is as

The mechanism of Cannizaro reaction is as Step Ist : Attack of nucleophile \(\mathrm{OH}^{-}\)to the carbonyl carbon

Step IInd : The transfer of hydride ion from anion (I) to second molecule of aldehyde and finally rapid transfer of proton takes place.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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