Geometrical isomerism is not possible in:

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(A) Geometrical isomerism requires restricted rotation around a double bond or a ring structure,where each carbon atom of the double bond is attached

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Propene

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(A) Geometrical isomerism requires restricted rotation around a double bond or a ring structure,where each carbon atom of the double bond is attached to two different groups.In $CH_3-CH=CH_2$ (Propene),one of the double-bonded carbons is attached to two identical hydrogen atoms,so it cannot exhibit geometrical isomerism.In $3-$Hexene $(CH_3-CH_2-CH=CH-CH_2-CH_3)$,the groups on each double-bonded carbon are different,allowing for $cis$ and $trans$ isomers.Butenedioic acid (Maleic and Fumaric acid) exhibits geometrical isomerism.Cyclic compounds like $1,2-$dimethylcyclopropane can also exhibit geometrical isomerism due to restricted rotation.

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