$\mathrm{H}_2 \mathrm{COH} \cdot \mathrm{CH}_2 \mathrm{OH}$ on heating with periodic acid gives

• A

  $2 \mathrm{CO}_2$
• B

  $2 \mathrm{HCOOH}$
• C

  
  
• Correct answer
  D

  
  

Solution

Key Idea Periodic acid is a mild oxidising agent, hence oxidises alcohol into aldehyde.

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