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On the basis of H-bonding explain that t...

On the basis of H-bonding explain that the second ionization constant `K_(2)`for fumaric acid is greater than for maleic acid.

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We know that H-bonding involving acidic H has an acid weakening effect. and H. bonding in conjugate base has an acid strengthening effect.
Both dicarboxylic acids have two ionisable H-atoms considering second ionization step.
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