Maleic acid and fumaric acid are forms of ...

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(B) Maleic acid and fumaric acid are both isomers of butenedioic acid with the molecular formula $C_4H_4O_4$. Maleic acid is the $cis$-isomer,where th

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Geometrical isomers

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(B) Maleic acid and fumaric acid are both isomers of butenedioic acid with the molecular formula $C_4H_4O_4$. Maleic acid is the $cis$-isomer,where the two carboxylic acid groups are on the same side of the double bond. Fumaric acid is the $trans$-isomer,where the two carboxylic acid groups are on opposite sides of the double bond. Since they differ in the spatial arrangement of groups around the double bond,they are classified as geometrical isomers.

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