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Question

Which of the following statement(s) is/are correct?

A
Cyclopropane has a non-planar structure.
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B
Cyclobutane has a non planar structure.
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C
Cyclopentane has a non planar structure.
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D
Cyclopentane has a planar structure.
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Solution

The correct options are
B Cyclobutane has a non planar structure.
C Cyclopentane has a non planar structure.
Cyclopropane is planar structure (all carbon atom in same plane) as shown below :


Cyclobutane is non planar structure and it has puckered like structure .
Puckered conformation of cyclobutane which increases the angle strain but decreases the torsional strain until a minimum energy balance between the two opposing effects is reached.
Cyclopentane is non planar structure and it has open envelope like structure.


Cyclopentane adopts a puckered, out of plane conformation that strikes a balance between increased angle strain and decreased torsional strain.

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