Problem: Isopentane (a.k.a. 2-methylbutane) is a compound containing a branched carbon chain. A Newman projection is given for six conformations about the C2-C3 bond of isopentane. On the curve of potential energy versus angle of internal rotation for isopentane, label each energy maximum and minimum with one of the conformations.

FREE Expert Solution

↑ Stability ↓ Potential energy

  • For Newman projections, Eclipsed conformations will have a higher PE compared to Staggered.
  • For eclipsed conformations, whenever -CH3 is eclipsed with another -CH3, these will have the greatest PE (B and D)
  • For staggered, when -CH3 is in the middle of the two -CH3s, these will have a moderate PE (C)
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Problem Details

Isopentane (a.k.a. 2-methylbutane) is a compound containing a branched carbon chain. A Newman projection is given for six conformations about the C2-C3 bond of isopentane. On the curve of potential energy versus angle of internal rotation for isopentane, label each energy maximum and minimum with one of the conformations.


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