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Question
Which one of the following has the lowest pKa value?
Options
CH3 – COOH
O2N–CH2–COOH
Cl–CH2–COOH
HCOOH
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Solution
O2N–CH2–COOH
Explanation:
It is simpler to remove an electron since the –NO2 group is an electron-withdrawing group. As a result, the acidity is stronger, and the pKa value is lower.
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