Maleic acid and fumaric acid are cis-trans isomers of each other.
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Fumaric acid being the trans isomer will have the least stearic
hindrance as the carboxylic acid groups will be on the different
sides of the double bonds-hence causing the least electronic
repulsion. Fumaric acid will be more stable as compared to maleic
acid.
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John Jacob Kessler has written:
'The nitrile of fumaric acid' -- subject(s): Fumaric acid,
Nitriles