Which of the following biphenyls is optically | vedclass

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(D) For a biphenyl derivative to be optically active,it must exhibit atropisomerism,which requires the presence of bulky substituents at the ortho pos

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(D) For a biphenyl derivative to be optically active,it must exhibit atropisomerism,which requires the presence of bulky substituents at the ortho positions of both phenyl rings to prevent free rotation around the central $C-C$ single bond.In option $D$,the molecule has bulky substituents ($Br$ and $I$) at all four ortho positions $(2, 2', 6, 6')$. This steric hindrance prevents the two phenyl rings from becoming coplanar,forcing them into a non-planar conformation that lacks a plane of symmetry and a center of inversion,thus making the molecule chiral and optically active.The other options lack sufficient ortho-substitution to prevent free rotation,allowing the molecules to adopt planar or symmetric conformations that are achiral.

Which of the following biphenyls is optically active?

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