Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Per-CH₂ strain : cyclohexane is strain-free (0); cycloheptane has a little torsional/steric strain; cyclobutane has large angle strain (~90°); cyclopropane has the largest (60° angles plus eclipsing). Hence cyclohexane $<$ cycloheptane $<$ cyclobutane $<$ cyclopropane.