Question

the energy of cis 1 3 dimethyl
cyclohexane​

Answer 1

cis-1,3-dimethylcyclohexane: The diaxial form would be more than 2 x 1.8 kcal/mol, because the two methyl groups would run into each other (rather than just into an axial hydrogen). The diequatorial form would have no steric interactions, so it would have a strain energy of 0. ... +1.8 kcal/mol.