In $\mathrm{D}$ - glucose $(\mathrm{X})$ and $\mathrm{D}$ - Fructose $(\mathrm{Y})$, which hydroxyl group participates in hemiacetal formation

• Correct answer
  A

  $\mathrm{C}-5$ in both $\mathrm{X}$ and $\mathrm{Y}$
• B

  $\mathrm{C}-5$ in $\mathrm{X}$ and $\mathrm{C}-6$ in $\mathrm{Y}$
• C

  $C-6$ in $X$ and $C-5$ in $Y$
• D

  $\mathrm{C}-4$ in both $\mathrm{X}$ and $\mathrm{Y}$

Solution

In both, glucose and fructose, C-5 atom participates in hemiacetal formation.

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