Which of the following does not show geometri | vedclass

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(C) Geometrical isomerism $(GI)$ in cyclic alkenes requires a ring size of at least $8$ carbon atoms to accommodate the trans-configuration without ex

Vedclass · Accepted Answer

$1-$deuterocyclopent$-1-$ene

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(C) Geometrical isomerism $(GI)$ in cyclic alkenes 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. 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 $GI$. $D$. $2$-methylpent-$2$-ene is an acyclic alkene that shows $GI$ because the carbons of the double bond are attached to different groups. Note: Both $B$ and $C$ do not show $GI$. However, in standard chemistry problems of this type, $1$-deuterocyclopent-$1$-ene is often considered the most definitive example of a ring too small for $GI$ due to the extreme strain of a trans-double bond in a $5$-membered ring. Given the options, $C$ is the most standard answer for 'does not show $GI$'.

Which of the following does not show geometrical isomerism?

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