Question

At what ring size do we start to see more stable cyclic rings?

Answer 1

Ale know, sp3 chybridized carbone have an oppoetod bond angle of 109.5°. Angle strain occers in a molecule when the sp3 hybridized carbons in cycloalkones do not have the expected bond angle of 109.50 . Angle strain is a destabilizing factor i Po case of myelopropane (sing size : 3) The bond angle im cycloppupano is 600, which deviates largely from that of sp3 hybridized carbons. Ther, angle strain occurs. Hence, & cycloprop and is not so stable.

In case of cyclobutane (ring size 4) 900 The bound angle im cyclobutano is goo, which also deviatos largely from the exported bond angle of sp3 hybridized carbone. Thes, angle atroon occurs. Hence, wyclobutane 23 also not stable. In case of cyclopentane (ring size = 5) The bond angle in cyclopentane is 1080, which is close to the expected bound angle of sp3 hybridized carbons. Thus, angle strain in absent in this case. Hence cyclopontane is stable. : The Ring Size at which we see more stable ringe = 5