Chemistry - STEREO ISOMERISM Question with Solution | TestHub

$\mathrm{Per}-\mathrm{C}{\mathrm{H}}_2$ strain : cyclohexane is strain-free (0); cyclopentane has small torsional strain from its puckering; cyclobutane has large angle strain (~90°); cyclopropane has the largest (60° angles plus full eclipsing). Hence cyclohexane $<$ cyclopentane $<$ cyclobutane $<$ cyclopropane.