1.

Assertion Addition of Br_(2) to cis-but-2-ene is stereoselective S_(N)2 reactions are stereospecific as well as stereoselective .

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Solution :A reaction is said to be stereo selective if a particular STEREOISOMER can give two or more stereoisomeric products but give one of them in greater amount than the other or even to the exclusion of the other So addition of `Br_(2)` to cis-but-2-ene is stereoselective SINCE it gives only ` (-+)2 3-`DIBROMOBUTANE .


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