The barrier to C-C bond rotation in iodoethane is 13 kJ/mol. What energy can you

Question

The barrier to C-C bond rotation in iodoethane is 13 kJ/mol. What energy can you assign to an H-Ieclipsing interaction?
Use strain energy increments from the table below in your calculation.

(Specify units, kJ/mol; Calculate to nearest 0.1 energy units)

Energy cost

Interaction

Cause

(kJ/mol)

(kcal/mol)

4.0

1.0

6.0

1.4

11.0

2.6

3.8

0.9

Energy cost

Interaction

Cause

(kJ/mol)

(kcal/mol)

H H eclipsed Torsional strain

4.0

1.0

H CH3 eclipsed Mostly torsional strain

6.0

1.4

CH3 CH3 eclipsed Torsional and steric strain

11.0

2.6

CH3 CH3 gauche Steric strain

3.8

0.9

Explanation / Answer

2.6 kJ/mol

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