The reaction of 1butene with HBr in the presence of peroxide gives:

2-bromobutane

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1-bromobutane

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1,1-dibromobutane

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1, 2-dibromobutane

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Solution

The correct option is B 1-bromobutane
The reaction of 1-butene with HBr in the presence of peroxide gives 1-bromobutane. The addition occurs according to anti Markownikoff's rule. A molecule of HBr is added across C=C double bond. Br is attached to C atom having maximum H toms.
$C H_{3} C H_{2} C H_{2} = C H_{2} + H B r p e r o x i d e - ---- \to C H_{3} C H_{2} C H_{2} C H_{2} B r$

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