Fumaric acid a diastereomer of maleic acid requires a much, Ask an Expert

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When maleic acid is heated to 200 degrees C, it loses water and becomes maleic anhydride. Fumaric acid, a diastereomer of maleic acid, requires a much higher temperature before it dehydrates; when it does, it also yields maleic anhydride. Provide an explanation for these observations

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