Maleate ion is more stable than Fumarate ion. Why?

Covalent bond

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Inter molecular H-bonding

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Intra molecular H-bonding

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Presence of double bond

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Solution

The correct option is C Intra molecular H-bonding

In fumaric acid, H of the oe acid group is very far from O of another acid group. Thus, no chance of H-bonding

Because of intra-molecular H-bonding, Maleate ion is more stable than Fumarate ion.

Thus, maleic acid gives up one easily to form a stable molecular ion. Thus, it is more acidic than Fumaric acid.

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