Q.

Which of the following is correct regarding stability of conformations of n-butane about C2-C3 bond? 

I)anti    II)gauche    III)partially eclipsed    IV) fully eclipsed 

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a

I>II>III>1V       

b

I>II>IV>III     

c

IV>III>II>I        

d

IV>II>I>III

answer is A.

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Detailed Solution

Dihedral angle is inversely proportional to stability of conformer, dihedral angles for fully (III) partially eclipsed, gauche and anti are respectively  0,60,120,180

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Which of the following is correct regarding stability of conformations of n-butane about C2-C3 bond? I)anti    II)gauche    III)partially eclipsed    IV) fully eclipsed