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Which of the following statements is not correct?

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Maleic acid is a weaker acid than fumaric acid.

Maleate monoanion is a weaker acid than fumarate monoanion.

Salicyclic acid, $o - {HOC}_{6} H_{4} COOH$ , is a stronger acid than $o - H_{3} {COC}_{6} H_{4} COOH .$

A more reactive acid derivative may be used to prepare a less reactive one by reaction with the appropriate nucleophile.

answer is A.

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Detailed Solution

(a) The maleic acid is a stronger acid because of the stabilisation of its monoanion due to H-bonding between the cis $COOH$ and ${COO}^{-}$ . This is not present in the trans isomer (fumarate anion).

(b) H-bonding in maleate monoanion makes the removal of H more difficult as compared to fumarate monoanion where H-bonding is not present.

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