Chemistry - STEREO ISOMERISM Question with Solution | TestHub

(A) The sp² ring carbon of the C=C bond is flanked by two different ring paths (towards the CH₃-bearing carbon and towards CH₂), and the outer carbon carries H and CH₃, so the double bond is stereogenic : GI shown.

(B) The outer alkene carbon carries two identical CH₃ groups and the ring has only one substituent : no GI.

(C) As in (A) the C=C bond is stereogenic, and in addition the 1,2-dimethylcyclopropane unit itself is cis/trans stereogenic : GI shown.

(D) The 2,3-dimethylcyclopropane ring shows cis-trans isomerism : GI shown.

Ans. (A, C, D)