In the following skew conformation of ethane, H′−C−C−H′′ dihedral angle is:
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Solution
A dihedral angle is the angle between two C−H bonds projected on a plane orthogonal to the C−C bond. In the given skew conformation, having Newman's projection the dihedral angle is: H′−C−C−H′′=(H′−C−C−Ha)+(Ha−C−C−H′′) =29o+120o=149o