Arrange in ascending order of heat of combustion:
I know heat of combustion is inversely proportional to stability. Also, to solve I did try making chair conformations of the substituted cyclohexane.
In same type of, say, 1,3,5-conformations one can do comparisons by seeing equatorial axial positions, as bulky group tend to be in equatorial positions. But how to compare and arrange when there is 1,2,3 and 1,2,4 and 1,3,5 substitutions?