Exams › JEE Advanced › Chemistry
Maleic anhydride can be prepared by which of the following methods?
- (1) Heating trans-but-2-enedioic acid (fumaric acid)
- (2) Heating cis-but-2-enedioic acid (maleic acid)
- (3) Treating cis-but-2-enedioic acid with alcohol and acid
- (4) Treating trans-but-2-enedioic acid with alcohol and acid
Correct answer: (2) Heating cis-but-2-enedioic acid (maleic acid)
Solution
Maleic acid (cis) has both -COOH groups on the same side, allowing intramolecular dehydration on gentle heating to give maleic anhydride. Fumaric acid (trans) requires vigorous conditions and isomerizes to maleic acid before forming the anhydride.
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