arrange the following newman projections of butane in order of energy.\ni < iii < ii < iv\niii < i < iv <…

arrange the following newman projections of butane in order of energy.\ni < iii < ii < iv\niii < i < iv < ii\nii < iv < i < iii\niv < ii < iii < i

arrange the following newman projections of butane in order of energy.\ni < iii < ii < iv\niii < i < iv < ii\nii < iv < i < iii\niv < ii < iii < i

Answer

Explanation:

Step1: Identify conformation types

The energy of butane conformations depends on steric hindrance. Gauche and eclipsed conformations have higher energy due to repulsions. Anti - conformation has the lowest energy.

Step2: Analyze each projection

  • Projection III is the anti - conformation (lowest energy) with the two methyl groups as far apart as possible.
  • Projection I is a gauche conformation with some steric repulsion between the methyl groups.
  • Projection IV is a partially eclipsed conformation with methyl - hydrogen and hydrogen - hydrogen eclipsing interactions.
  • Projection II is a fully eclipsed conformation (highest energy) with methyl - methyl eclipsing interaction.

Step3: Arrange in energy order

Based on the above analysis, the order of increasing energy is III < I < IV < II.

Answer:

III<I<IV<II