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CH3 − CH = CH − CH2 + HBr → A. A (predominantly) is:

1. CH3 − CH − CH2 − CH2Br
2. CH3 − C − CH2 − CH3 | CH3
3. CH3 − CH − CH − CH3 | Br CH3
4. CH3 − CH − CH − CH3 | CH3 Br

Correct answer: CH3 − CH − CH − CH3 | Br CH3

Solution

The reaction follows Markovnikov's rule, where the H from HBr adds to the carbon with more hydrogens, and Br adds to the carbon with fewer hydrogens. This results in the formation of CH3 − CH − CH − CH3 with Br attached to the second carbon.

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