Question

Which of the following pentoses will be optically active

$\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HOCH \\ | \\ HCOH \\ | \\ CH_{2}OH \\ I \end{matrix}$ $\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HCOH \\ | \\ HOCH \\ | \\ CH_{2}OH \\ II \end{matrix}$ $\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HCOH \\ | \\ HCOH \\ | \\ CH_{2}OH \\ III \end{matrix}$

• A. All
• B. II and III
• C. I
• D. II

Answer 1

Answer: (A)

All

Answer 2

All are optically active.