Which of the following does not show geometri | vedclass

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(B) Geometrical isomerism $(GI)$ in cycloalkenes requires a ring size of at least $8$ carbon atoms to accommodate the trans-configuration without exce

Vedclass · Accepted Answer

$3-$bromocyclohex$-1-$ene

Vedclass · Answer

(B) Geometrical isomerism $(GI)$ in cycloalkenes requires a ring size of at least $8$ carbon atoms to accommodate the trans-configuration without excessive ring strain. $A$. $1$-chlorocyclooct-$1$-ene has an $8$-membered ring,which is large enough to exhibit $GI$. $B$. $3$-bromocyclohex-$1$-ene is a $6$-membered ring. While it has a chiral center,it does not show $GI$ because the double bond is constrained in a small ring. $C$. $1$-deuterocyclopent-$1$-ene is a $5$-membered ring,which is too small for $GI$. However,the question asks for the molecule that does not show $GI$. Among the options,$3$-bromocyclohex-$1$-ene is the standard example of a small ring that cannot exhibit $GI$ due to the stability of the cis-isomer and the inability to form a stable trans-isomer in a $6$-membered ring. $D$. $2$-methylpent-$2$-ene is an acyclic alkene that shows $GI$ because the carbons of the double bond are attached to different groups.

Which of the following does not show geometrical isomerism?

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