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Hydroboration

Which alkene ...

Question

Which alkene gives a meso compound upon reaction with $B r_{2}$ in $C H_{2} C l_{2}$ ?

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Solution

The correct option is B
When anti addition takes place to a symmetrical trans alkene then meso compound is formed.
Among given options, trans alkene i.e. trans-but-2-ene, is present so it will give meso compound. Hence, option (a) is correct.

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