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Question

In the following skew conformation of ethane, HCCH′′ dihedral angle is

A
58o
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B
149o
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C
151o
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D
120o
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Solution

The correct option is B 149o
In Newman projection the angle between two substitutent in same carbon atom is 120o.
Given, angle between HCCH is 29o
Angle between HCCH′′=(HCCH)+(HCH′′)
Dihedral angle,HCCH′′=29o+120o
=149o


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