1.

Assertion: Addition of Br_(2) to c9s-but-2-ene is stereoselective. Reason: S_(N^(2)) reactions are stereospecific as well as stereoselective.

Answer»

If both assertion and RESON are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.

Solution :A reaction is said to be stereoselective if a stereoisomeric PRODUCTS but GIVES one of them in greater amount than the other or even to the exlucsion of the other. So, adition of `Br_(2)` to cis-but-2-ene is stereoselective since it gives only `(+-)` 2,3-dibromobutane.


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