Question

which of the following biphenyl is optically active
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Answer 1

Answer:

option khaa h

Explanation:

We know that a biphenyl is an organic compound and it has two phenyl rings attached to each other through a single bond. Firstly, if three or more ortho positions in the biphenyl is substituted i.e. occupied by a certain group, then the biphenyl will be resolvable i.e. optically active.

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Answer 2

Answer:

The biphenyl which are ortho substituted with bulky group results in steric hindrance.

Suitably substituted diphenyl compounds are devoid of individual chiral carbon atom but the molecules are chiral due to restricted rotation around the single bond between the two benzene nuclei.

They exist in two non-super imposable mirror images of each other. Such isomerism is called atropisomerism.