MEDIUMMCQ SINGLEJEE Mains ChemistryOrganic ChemistryAldehydes and ketonesPrevious Year Questions

If heavy water is taken as solvent instead of normal water while performing Cannizzaro reaction, the products of the reaction are (AIIMS 2009)

A.RCOO– + RCH2OH
B.RCOO– + RCH2OD✓ Correct
C.RCOOD + RCD2OD
D.RCOO– + RCD2OD
Explanation

Cannizzaro’s reaction is a chemical property of the aldehydes. The aldehydes that do not have Hydrogen can undergo disproportionation reaction, i.e., self oxidation and reduction reaction. The mechanism involved in the Cannizzaro’s reaction is, first is the nucleophilic attack which is fast reaction, then is the hydride transfer which is the slow step i.e. the rate determining step, and then comes the H transfer. The mechanism is as follows: Aldehydes and Ketones 30 Only the hydrogen ion of the alcohol is taken from the solvent, so if the solvent is 2 D O , the product will be 2 RCH OD .

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