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Question

D-Erythrose and D- threose is separately reduced with NaBH4 to give the products (A) and (B) respectively. Which of the following statements is correct about (A) and (B)?

A
Both (A) and (B) will be optically active.
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B
Both (A) and (B) will be optically inactive.
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C
(A) will be optically inactive but (B) will be optically active.
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D
Neither (A) not (B) possesses any asymmetric carbon atom.
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Solution

The correct option is C (A) will be optically inactive but (B) will be optically active.
As the mirror image of A is symmetrical and superimposed on each other so A is optically inactive.

while the mirror images of B is non-superimposable and unsymmetrical so they are optically active.

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