Sec 2 Stability of Cycloalkanes:Ring Strain Angle strain The strain induced in a molecule when bond angles are forced to deviate from the ideal 109 tetrahedral value(Adolf von Baeyer-1885) 1og°tetrahedral 199 499 90° 108 20° 601 Cyclopropane Cyclobutane Cyclopentane Cyclohexane eLeingAlihRered.Angle strain ▪ The strain induced in a molecule when bond angles are forced to deviate from the ideal 109º tetrahedral value (Adolf von Baeyer – 1885) Sec 2 Stability of Cycloalkanes: Ring Strain