Which of the following conformations of butan | vedclass

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(B) The stability of butane conformations is determined by torsional strain and steric hindrance (van der Waals repulsion).$I$ represents the gauche c

Vedclass · Accepted Answer

$III$

Vedclass · Answer

(B) The stability of butane conformations is determined by torsional strain and steric hindrance (van der Waals repulsion).$I$ represents the gauche conformation (staggered,relatively stable).$II$ represents the anti conformation (staggered,most stable).$III$ represents the fully eclipsed conformation (highest energy due to $CH_3-CH_3$ repulsion,least stable).$IV$ represents the eclipsed conformation (less stable than staggered,but more stable than fully eclipsed).Therefore,the least stable conformation is $III$.

Which of the following conformations of butane is the least stable?

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