To determine the major product in the given reaction, let's analyze the reaction mechanism involved.
In the reaction shown, phenylbromoalkene is treated with Hydrobromic acid (HBr). The structure can be analyzed as:
The reaction is an example of an addition reaction where HBr adds across the carbon-carbon double bond.
Mechanism:
HBr provides a proton (\(H^+\)) which adds to one of the carbon atoms of the double bond forming a more stable carbocation. The stability is enhanced by the phenyl group's resonance effects.
Br^-\ (bromide ion) then attacks this carbocation. The Markovnikov’s addition rule applies here, where the Br⁻ adds to the more substituted carbon of the double bond, due to its stability.
Thus, the major product is the one where the Br is added to the more substituted carbon, leading to:
This product is in accordance with Markovnikov’s rule, where in an electrophilic addition to an alkene, the proton (\(H^+\)) is added to the less substituted carbon and the substituent (Br) to the more substituted carbon, increasing stability.
Conclusion: The major product of the reaction when phenylbromoalkene is treated with HBr is correctly represented in the image above.
