1.

In the reaction : CH_(2) = CH - CH = CH_(2) + Br_(2) overset(-40^(@)C)rarr the predominant product is :

Answer»

3, 4-Dibromo but-1-ene
1, 4-Dibromo but-2-ene
1, 2, 3, 4-Tetrabromobutane
2, 4-Dibromo but-2-ene

Solution :The addition to conjugate diene at `-40^(@)C` GIVES 1, 4-addition product.
`CH_(2) = CH - CH = CH_(2) + Br_(2) overset(-40^(@)C)rarr UNDERSET(Br)underset(|)(CH_(2))-CH = CH - CH_(2)Br`
At low TEMPERATURES `(-80^(@)C)` it gives 1, 2-addition product.


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