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Explain peroxide effect....

Explain peroxide effect.

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In presence of peroxide, addition of hydrogen bromide to unsymmetrical alkenes takes place against the Markownikoff rule [i.e. Antimarkownikoff rule]. This reaction is restricted to addition of HBr alone but not with hydrogen chloride or hydrogen iodide. This is known as peroxide effect or kharash effect.
`CH_(3) - underset("Propene")(CH = CH_(2)) + HBr overset("peroxide")(rarr) underset(1 - "bromopropane (major)") (CH_(3) - CH_(2) - CH_(2)Br)`
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