Which of the following alcohols is expected to have the lowest pk_avalue ?

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2-Fluoro ethanol

2-Chloroethanol

2,2,2-Trifluoroethanol

Ethanol

answer is C.

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Detailed Solution

Compound that is highly acidic, has the highest k_avalue and lowest pk_a value. In the given question, 2,2,2-Trifluoroethanol is highly acidic because of the presence of highly electronegative atom, F. This implies that this molecule has high k_avalue and low pk_a value.

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