Discussion
Relationship between compound I and II is :
Answer: A
Compounds I and II are diastereomers.
Both are trimethylcyclohexanes with the same 1,2,4 substitution pattern, so they are not constitutional isomers. Reading the chairs, in I all three methyl groups lie on the same face of the ring. In II the methyl at the position corresponding to one of the adjacent pair points to the opposite face from the other two.
Ring flipping changes axial and equatorial positions but never which face a group is on, so II cannot be a conformer of I. A different relative configuration that is not a mirror image is diastereomerism, so they are diastereomers rather than enantiomers.
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