Which does not give Cannizzaro reaction?

Which does not give Cannizzaro reaction?
  1. $\mathrm{HCHO}$

  3. $\mathrm{Ph}-\mathrm{CHO}$
  4. $\mathrm{Ph}-\mathrm{CH}_2-\mathrm{CHO}$

Solution

Aldehydes having no $\alpha-\mathrm{H}$ atoms undergo Cannizzaro reaction. Hence all the given compounds (except $\mathrm{PhCH}_2 \mathrm{CHO}$ has $\alpha-\mathrm{H}$ atom) will undergo Cannizzaro reaction.

Asked in: NEET 2018

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