In trans-1,2-dimethylcyclohexane the diequatorial chair has one gauche CH3/CH3 interaction, while the diaxial chair has four CH3/H 1,3-diaxial interactions. Take each interaction (gauche CH3/CH3 and CH3/H 1,3-diaxial) as 3.8 kJ/mol. The diaxial chair is less stable than the diequatorial chair by

1. A$15.2\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
2. B$11.4\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
3. C$7.6\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$
4. D$3.8\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$