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The number of alkenes among the followin...

The number of alkenes among the following that would give the same product on addition of HBr, in absence or presence of peroxide is ..........
Propene, I-butene, 2- butene, 2-methyl propene, 3-methyl 1- butene, 2, 3-dimethyl-1-butene, 2- pentene

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The correct Answer is:
1
The reaction involved are
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