Which of the following pentoses will be optically active \[\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HOCH \\ | \\ HCOH \\ | \\ C{{H}_{2}}OH \\ I \\ \end{matrix}\] \[\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HCOH \\ | \\ HOCH \\ | \\ C{{H}_{2}}OH \\ II \\ \end{matrix}\] \[\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HCOH \\ | \\ HCOH \\ | \\ C{{H}_{2}}OH \\ III \\ \end{matrix}\] [MP PET 1994]

Which of the following pentoses will be optically active

1.	Which of the following pentoses will be optically active \[\begin{matrix} CHO \\ \| \\ HCOH \\ \| \\ HOCH \\ \| \\ HCOH \\ \| \\ C{{H}_{2}}OH \\ I \\ \end{matrix}\] \[\begin{matrix} CHO \\ \| \\ HCOH \\ \| \\ HCOH \\ \| \\ HOCH \\ \| \\ C{{H}_{2}}OH \\ II \\ \end{matrix}\] \[\begin{matrix} CHO \\ \| \\ HCOH \\ \| \\ HCOH \\ \| \\ HCOH \\ \| \\ C{{H}_{2}}OH \\ III \\ \end{matrix}\] [MP PET 1994]
A.	All
B.	II and III
C.	I
D.	II
Answer» B. II and III

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