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COMEDK2023Evening ShiftChemistryAldehydes and KetonesActual

What would be the products obtained when a mixture of p-Methoxy benzaldehyde and Methanal are heated with 50 % concentrated Caustic soda solution?

Options

  1. Ap- Methoxy benzyl alcohol and methanol.
  2. Bp- Methoxy sodium benzoate and sodium formate
  3. Cp-Methoxy benzyl alcohol and sodium formate.
  4. Dp- Methoxy sodium benzoate and sodium acetate.

Correct answer

C. p-Methoxy benzyl alcohol and sodium formate.

Step-by-step solution

The reaction between p-Methoxybenzaldehyde and Methanal in the presence of concentrated aqueous sodium hydroxide (50% NaOH) is a crossed Cannizzaro reaction. In a crossed Cannizzaro reaction involving an aromatic aldehyde and formaldehyde, formaldehyde acts as the reducing agent because it is more reactive towards nucleophilic attack by the hydroxide ion ( OH⁻ ). The mechanism involves the nucleophilic attack of OH⁻ on the carbonyl carbon of formaldehyde to form a hydride donor species, which then transfers a hydri

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