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JEE Advanced levelSingle correct optionDifficulty 3 of 3g1020

Arrange in decreasing order of the first dissociation constant: (P) oxalic acid $HOOC - COOH$ , (Q) malonic acid $HOOC - CH X_{2} - COOH$ , (R) succinic acid $HOOC - CH X_{2} CH X_{2} - COOH$ , (S) acetic acid.

AS > R > Q > P
BP > Q > R > S
CQ > P > R > S
DP > R > Q > S

Answer: B

On first ionisation the second

COOH

group acts as a -I substituent on the ionising one, and its effect falls with the number of

CH X_{2}

groups between them. This gives oxalic (pKa1 1.3) > malonic (2.8) > succinic (4.2) > acetic (4.8).

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