Identify the correct combination(s).

c i s - 2 - b u t a n e C o l d & d i l - --------- \to A l k a l i n e K M n O_{4} M e s o - b u t a n e - 2, 3 - d i o l

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t r a n s - 2 - b u t a n e m C p B A / H_{3} O^{+} - -------- \to (\pm) - b u t a n e - 2, 3 - d i o l

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c i s - 2 - p e n t e n e O s O_{4} / N a H S O_{3} (a q) - ----------- \to M e s o - p e n t a n e - 2, 3 - d i o l

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c i s - 2 - b u t a n e B r_{2} / C C l_{4} - ----- \to (\pm) - 2, 3 - d i b r o m o b u t a n e

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Solution

The correct option is D $c i s - 2 - b u t a n e B r_{2} / C C l_{4} - ----- \to (\pm) - 2, 3 - d i b r o m o b u t a n e$
(a) Symmetric cis alkene $S y n a d d^{n} - ---- \to$ meso product.

(b) symmetric trans alkene $A n t i a d d i t i o n - ------- \to$ meso product.

(c) Unsymmetric cis/trans alkene $S y n / a n t i - ---- \to a d d t i o n$ Racemic mixture.

(d) Symmetric cis alkene $A n t i a d d^{n} - ----- \to$ Racemic mixture.

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