Consider the following sequence of reactions
The incorrect statement about $\mathrm{R}$ is

• A

  It gives test with Tollen's reagent
• Correct answer
  B

  It undergoes Cannizaro reaction
• C

  It gives iodoform test
• D

  It undergoes aldol condensation

Solution

As we can see, $\mathrm{R}$ has $\alpha$-hydrogens present so it cannot undergo cannizaro reaction.

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