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| 1. |
Explain peroxide effect. |
| Answer» Solution :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. <BR> `CH_(3) - underset("Propene")(CH = CH_(2)) + HBr overset("peroxide")(rarr)underset(1 - "bromopropane (major)") (CH_(3) - CH_(2) - CH_(2)Br)` | |