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Question

D(-)-ErythroseNaBH4−−−P
D(-)-Threose NaBH4−−−R
Which of the following statement is correct about P and R?

A
Both are optically active
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B
Both are optically inactive
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C
P is optically inactive and R is optically active
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D
Neither P nor R has asymmetric carbon
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Solution

The correct option is C P is optically inactive and R is optically active
P is optically inactive as it contains the center of symmetry and R is optically active as it contains no element of symmetry.
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