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Question

The dihedral angle between two methyl group in partially eclipsed conformation of n-butane is :

A
180
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B
120
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C
90
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D
10928
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Solution

The correct option is B 120
The partially eclipsed structure of n-butane is

the dihedral angle between two methyl group is 120.
The dihedral angle between two methyl group in anti-staggered conformation of n-butane is 180.
The dihedral angle between two methyl group in fully-eclipsed conformation of n-butane is 0.
The dihedral angle between two methyl group in fully gauche-staggered and partially gauche-staggered in conformation of n-butane is 60 and 300 .

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