The following eclipsed form of propane is rep | vedclass

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Question

(B) In the Newman projection of propane,the front carbon is bonded to one methyl group $(-CH_3)$ and two hydrogen atoms $(-H)$. The back carbon is bon

Vedclass · Accepted Answer

$120$

Vedclass · Answer

(B) In the Newman projection of propane,the front carbon is bonded to one methyl group $(-CH_3)$ and two hydrogen atoms $(-H)$. The back carbon is bonded to three hydrogen atoms $(-H)$.For the eclipsed conformation to repeat itself,the front carbon must be rotated such that the methyl group aligns with another hydrogen atom on the back carbon.Since the back carbon has three identical hydrogen atoms arranged at $120^o$ to each other,rotating the front carbon by $120^o$ will bring the methyl group to the position of the next hydrogen atom,resulting in an identical eclipsed conformation.Thus,the eclipsed form is repeated after a rotation of $120^o$.

The following eclipsed form of propane is repeated after rotation by an angle of $......^o$.

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