Question

How and why do monosubstituted alicyclic compounds not exhibit positional isomerism?

Answer 1

Monosubstituted hexane compounds has following structure as shown in above image.

In this compound, all the positions of $X$ will be same, i.e., $X$ being on any carbon from $1$ to $6$ will give the same compound as all those carbons are similar with $s{p}^3$ hybridization.

Same is the case with other alicyclic compounds due to which they do not exhibit position isomerism.