In the following skew conformation of ethane, H′−C−C−H′′ 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 B149o In Newman projection the angle between two substitutent in same carbon atom is 120o. Given, angle between H′−C−C−His29o AnglebetweenH′−C−C−H′′=(H′−C−C−H)+(H−C−H′′) ∴Dihedralangle,H′−C−C−H′′=29o+120o =149o