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The key feature in the product that shows what is going on is the trans configuration of the two bromines. This is characteristic of the addition of elemental bromine via a brominium ion mechanism here. So where does the Br2 come from as we started with HBr? This is where the hydrogen peroxide comes in. It is well documented example here that hydrogen ...


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Dipole moment is what matters in substituted biphenyls. The dipole moment in the first case is from left ring to right ring due to -OH groups predominant +M effect to the ring.(the alkene being an EWG(electron withdrawing group)), further enhances this effect. So effectively, electron density is more in the right hand side (I know it is counter-intuitive ...


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The second one will be more stable. We usually first check for resonance as it is more effective. But here it has to be explained on basis of hyper conjugation because the resonance due to the ring is same in both. But the second one will have more hyper conjugating structures as greater number of alpha hydrogens are present. More about hyper conjugation ...


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The Second One Will be More Stable as it has one of the resonating structure with octet configuration that is when the the double bond of the ring comes out and participates in the formation of double bond with the carbocation which is out of ring in no case the double bond from the first molecule will be involved in resonance ....


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