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Question

Which of the following is optically inactive?

A
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B
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C
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D
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Solution

The correct option is C
Biphenyl Systems show optical activity when the following conditions are satisfied:
  • Each ring should have 2 different ortho substituting groups.
In a each ring have 2 different ortho substituting groups (COOH and NO2. thus it is optically active.

In even cumulenes, having different terminal atoms/groups, two mutually perpendicular π bonds are formed. Hence, the terminal atoms/groups attached to the terminal sp2 carbons are in different planes. So, elements of symmetry (POS, COS) are absent. Hence, even-cumulenes are optically active. so b and d are optically inactive.


c is not chiral carbon because 4 different group is not present on central carbon hence it is optically inactive.

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