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  4. The number of stereoisomers obtained by bromination of trans- 2- butene is

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Q. The number of stereoisomers obtained by bromination of trans- $2$- butene is

JEE AdvancedJEE Advanced 2007

Solution:

The possible stereoisomers from trans-$2$-butene are
image
Of these, $(II)$ is a meso compound, that is, one half of the molecule is mirror image of the other half, even though it contains a chiral centre. Thus, there is only one stereoisomer.