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cis-But`-2-`ene reacts with `D -N=N-D` to yield the major product

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cis-But`-2-`ene reacts with `D -N=N-D` to yield the major product
A. meso`-2,3-`dideuteriobutane
B. `(+)-2,3-`dideuteriobutane
C. `(-)-2,3-`dideuterionutane
D. `(+)-2,3-`dideuteriobutane
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Correct Answer - A
Alkenes are reduced toc cis-products (syn-addition) by di-imide:
image
This stereospecificity can be explained by the formation a cyclie transition state.
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