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Which of the following biphenyls is optically active?

1. O2N
2. BrBr
3. I
4. CH3

Correct answer: O2N

Solution

A biphenyl is optically active when rotation about the central bond is hindered enough to give stable atropisomers. The nitro-substituted option has the strongest steric/electronic effect among the choices, making the two rings non-coplanar and chiral.

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