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NEET levelSingle correct optionDifficulty 1 of 3co168

Use pKa values: formic acid 3.75, ethanoic acid 4.76, benzoic acid 4.20, chloroethanoic acid 2.86. The strongest acid among these is

Achloroethanoic acid, $ClCH X_{2} COOH$
Bethanoic acid, $CH X_{3} COOH$
Cformic acid, $HCOOH$
Dbenzoic acid, $C X_{6} H X_{5} COOH$

Answer: A

A lower pKa means a larger

K_{a}

and a stronger acid. The smallest value is 2.86, belonging to chloroethanoic acid, whose

- I

effect of chlorine stabilises the carboxylate.

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