What does the given structure represent?

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(B) The given structure is $(CH_3)_2C=CH-CH(CH_3)COOH$ ($4$-methylpent$-3-$enoic acid).$1$. Geometric isomerism: The molecule has a $C=C$ double bond.

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Optical isomer

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(B) The given structure is $(CH_3)_2C=CH-CH(CH_3)COOH$ ($4$-methylpent$-3-$enoic acid).$1$. Geometric isomerism: The molecule has a $C=C$ double bond. The carbon atom at position $3$ is bonded to two identical methyl groups $(CH_3)$. For geometric isomerism,each carbon of the double bond must be attached to two different groups. Since one carbon is attached to two identical groups,it does not exhibit geometric isomerism.$2$. Optical isomerism: The molecule contains a chiral carbon atom at position $2$ (the carbon attached to $-H, -CH_3, -COOH$ and the $-CH=C(CH_3)_2$ group). Since it has a chiral center,it exhibits optical isomerism.

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