Question

Hydride ion transfer takes place in
(a) Frankland method
(b) Wurtz reaction
(c) Cannizzaro's reaction
(d) Wolf-Kishner reduction

Answer 1

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Option B is correct ✔✔

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Answer 2

Cannizzaro's reaction mechanism involves the transfer of a hydride ion.

• Cannizzaro reaction involves the reaction of two aldehyde molecules to yield primary alcohol and a carboxylic acid.
• The reaction is carried out in presence of a basic catalyst like sodium or potassium hydroxide.
• The mechanism involves both oxidation and reduction, one aldehyde oxidation to carboxylic acid and the other aldehyde reduction to alcohol.
• A tetrahedral intermediate is formed when the hydroxide attacks the first carbonyl carbon.
• This intermediate rearranges to form carbonyl again, transferring a hydride ion to attack other carbonyl carbon.
• The general reaction and mechanism of the Cannizzaro reaction are depicted in the below attachment.