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Which of the following aldehydes give the Cannizzaro reaction on heating with concentrated aqueous ?

  1. A2,2-dimethylpropanal
  2. Bbenzaldehyde
  3. Cmethanal
  4. Dethanal

Answer: A, B, C

The Cannizzaro reaction needs an aldehyde with no alpha hydrogen. Methanal, benzaldehyde and have none. Ethanal has alpha hydrogens and undergoes aldol condensation instead.
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