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 \[\begin{

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