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  4. The addition of Br2 to (E) - but - 2 - ene gives

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Q. The addition of $Br_2$ to (E) - but - 2 - ene gives

UPSEEUPSEE 2018

Solution:

The addition of bromine to E- but-2-ene gives $( R , S )-2-3$ dibromobutane, it is always anti as bromine atoms added are on opposite sides.

In $( E )$ -but $-2$ -ene addition of $Br _{2}$ occurs as:

image

$( R , S )-2-3$ - dibromobutane.