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NEET levelSingle correct optionDifficulty 1 of 3g2002

Which of the following gives the correct order of decreasing acidic strength?

A $CH X_{3} COOH > C X_{6} H X_{5} OH > C X_{2} H X_{5} OH > HC \equiv CH$
B $CH X_{3} COOH > C X_{2} H X_{5} OH > C X_{6} H X_{5} OH > HC \equiv CH$
C $C X_{6} H X_{5} OH > CH X_{3} COOH > C X_{2} H X_{5} OH > HC \equiv CH$
D $CH X_{3} COOH > C X_{6} H X_{5} OH > HC \equiv CH > C X_{2} H X_{5} OH$

Answer: A

pKa values: acetic acid 4.76, phenol 10.0, ethanol 15.9, ethyne 25. Lower pKa means stronger acid, so the order of decreasing acidity is acetic acid > phenol > ethanol > ethyne.

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