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How many gauche conformations are possib...

How many gauche conformations are possible for n-butane?

A

Just one

B

Four

C

Two

D

Three

Text Solution

Verified by Experts

The correct Answer is:
C

They are nonsuperposable mirror images of each other. The dihedral angle between the two methyl groups in the gauche conformations of `n`-butane is actually somewhat larger than `60^(@)` on account of van der Waals strain ( or steric strain).
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