The hydrogen atom bonded to the carbon designated by which number in $\stackrel{4}{\mathrm{C}} \mathrm{H}_3-\stackrel{3}{\mathrm{C}} \mathrm{H}_2-\stackrel{2}{\mathrm{C}} \mathrm{H}_2-\stackrel{1}{\mathrm{C}} \mathrm{HO}$ is most acidic.

• A

  $C-4$
• Correct answer
  B

  $C-2$
• C

  $C-3$
• D

  $C-1$

Solution

Hydrogen C-2 is more acidic because associated with the carbonyl group.

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