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Meso-2,3-dibromobutane reacts with iodid...

Meso-2,3-dibromobutane reacts with iodide ion more rapidly than does `(+-)` compounds. What are the respective alkenes formed ? Explain.
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In meso compound, there is less strain is less strain of the `trans-(Me)` groups than in `(+-)` compound where the `(Me)` groups are in cis-position.
Thus, the activation energy of each `T.S` of the former reaction is lower than that of the corresponding transition states of the latter reaction.
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