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Question

Which of following acid remains unaffected on heating?

A
Malonic acid
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B
Maleic acid
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C
Fumaric acid
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D
Succinic acid
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Solution

The correct option is C Fumaric acid
It remains unaffected upon heating because the trans double present in the compound at the α position of COOH group prevents many reactions performed by carboxylic acids. When melted it does isomerize and form maleic anhydride. Few materials are completely immune to heat.

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