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Question

Write the name of the major organic product formed in the reaction of 1-pentene with HBr.

A
1-bromopentane
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B
2-bromopentane
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C
3-bromopentane
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D
None of these
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Solution

The correct option is D 2-bromopentane
1-pentene reacts with hydrogen bromide to form 2-bromopentane. This is an example of the electrophilic addition reaction. The addition occurs according to Markownikoff's rule; the negative part (Cl) of the reagent goes to the more substituted carbon atom.

CH2=CHCH2CH2CH3+HBrCH3CHBrCH2CH2CH3
Hence, the correct option is B.

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