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JEE Main levelSingle correct optionDifficulty 2 of 3g1010

Which of the following alcohols is the most acidic in water?

A $CH X_{3} CH X_{2} CH X_{2} OH$
B $CF X_{3} CH X_{2} OH$
C $(CH X_{3}) X_{3} COH$
D $CH X_{3} CH X_{2} OH$

Answer: B

The

CF X_{3}

group has a strong -I effect and stabilises the alkoxide ion.

CF X_{3} CH X_{2} OH

(pKa about 12.4) is much more acidic than ethanol or propan-1-ol (about 16) and tert-butyl alcohol (about 19).

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