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Question

Dihedral angle of least stable conformer of ethane is :

A
0
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B
120
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C
180
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D
60
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Solution

The correct option is A 0
Ethane has two conformers
(i) Eclipsed
(ii) Staggered

Eclipsed conformer is least stable while staggered conformer is most stable. In eclipsed conformer the dihedral angle is 0





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