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Q.

Incorrect statement about maleic acid and fumaric acid is ?

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a

Maleic acid is more soluble than fumaric acid in water.

b

Melting points of fumaric acid is greater than maleic acid.

c

PKa1  of maleic acid is more than PKa1  of fumaric acid.

d

Ka2  of maleic acid is less than Ka2  of fumaric acid. 

answer is C.

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Detailed Solution

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Fumaric acid is trans-butenedioic acid and Maleic acid is cis-butenedioic acid. Maleic acid exhibits the intramolecular hydrogen bonding that is not possible in fumaric acid for geometric reasons. these intramolecular hydrogen bonds make it difficult to release hydrogen to act as an acid.

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