How many of the following alkenes on add...

How many of the following alkenes on addition of HBr would give the sae product in the presence or absence of peroxide propene, 1-butene, 2-butene, 2-methylpropene, 3-methyl-1-butene, 2,3-dimethyl-1-butene, 2-pentene, 1-pentene, 4-methyl-2-pentene

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The correct Answer is:

Only 2-butene is symmetrical and hence gives the same product in presence or absence of peroxide.

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Addition of HBr to 2-pentene gives

2-bromopentane only

3-bromopentane only

2-bromopentane and 3-bromopentane

1-bromopentane and 3-bromopentane

2-bromopentane only

3-bromopentane only

2-bromopentane and 3-bromopentane

1-bromopentane and 3-bromopentane

1-Bromobutene

2-Bromobutene

1-Bromobutane

2-Bromobutane