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Question

Which of the following bond, rotation is not permitted by conformational isomerism at room temperature?

A
CC bond
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B
C=Cbond
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C
CC bond
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D
(a) and (b) above.
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Solution

The correct option is D (a) and (b) above.
If two different 3D arrangements in space of the atoms in a molecule are interconvertible merely by free rotation
about bonds, they are called conformations.
t permits free rotation (at room temperature) about σ bond only, C-C/ C-N/ C-O/ N-N/ O-O etc. So, the correct answer will be option (d).


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