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Consider the following reactions....

Consider the following reactions.

A

B

C

D

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The correct Answer is:
D
Syn-hydroxylation (stereospecific) : product is meso (one product) hence regioselective.
(b) trans-Compound + Anti-hydroxylation (stereospecfic) , product is meso (one product) hence regioselective.
(c) `CH_2N_2` products singlet carbene and the reaction is both stereospecific and regioselective.
(d) `CH_2 = C=O` products triplet carbene and the reaction is both non-stereospecific and non-regioselective.
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