Which is the strongest acid ( \( \mathrm{p} K_{a} \) value is given)? (a) \( \mathrm{HCOOH} \) [...

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Which is the strongest acid ( \( \mathrm{p} K_{a} \) value is given)?
(a) \( \mathrm{HCOOH} \) [3.77]
(b) \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH} \) [4.22]
(c) \( \mathrm{CH}_{3} \mathrm{COOH} \) [4.7]
(d) \( \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH} \) [4.88]
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