Question

Which of the following biphenyls is optically active ?
[2016]

Answer 1

Option B is the optically active compound.

Explanation:

• Ortho effect is an effect that is seen in biphenyls.

• This effect is seen when in the biphenyls when one or both has ortho substitution, there is a steric hindrance in the plane of that phenyl group.

• This pushes the other phenyl group in a plane that is perpendicular to that of the other phenyl group.

• In both option C and D, there are planes or points of symmetry in the compounds that makes them optically inactive.

• But in option A, there is no plane of symmetry, but also no ortho effect.

• This makes all the carbon lie on same plane, hence no optical effect.

• In option B, due to otho effect, there's two different planes of the compound.

• This makes no point or plane of symmetry between the compounds.

• So this will show optical isomerism.

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