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Question

Choose the correct statement regarding oxalic acid and malonic acid.

A
None of the above
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B
Both oxalic and malonic acid has similar ionisation value
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C
First ionisation value of malonic acid is higher than oxalic acid
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D
First ionisation value of oxalic acid is higher than malonic acid
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Solution

The correct option is D First ionisation value of oxalic acid is higher than malonic acid
The increase in the CH2 group in the compound will decrease the acidic strength of the compound because CH2 is an +I effect group so, it will increase the electron density on conjugate base.
Oxalic acid doesn't have +I group so it is more acidic.
Hence, the anion formed after the removal of first H+ of oxalic acid is more stable due to stronger I effect of COOH present at close distance.
Malonic acid has one CH2 which shows +I effect and increase electron density and make the conjugate base less stable so it is less acidic.
Strength of acidIonisation value of acid
Therefore, the correct option is (a).

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