Cannizzaro's reaction is an example of auto oxidation

• A

  It is a typical reaction of aliphaticaldehyde.
• B

  It is a reaction answered only by aromaticaldehydes
• C

  It is a reaction answered by all aldehydes,
• Correct answer
  D

  None of the above

Solution

Cannizzaro reaction is an example auto oxidation. Aldehydes which do not contains a- hydrogen atom such as
benzaldehyde \( \left(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHO}\right) \), formaldehyde \( (\mathrm{HCHO}) \) undergo auto-oxidation and reduction when treated with
concentrated alkali.

Hence, the correct answer is option: 'D'.