Which of the following has the highest value of ${p K}_{a}$ ?

{C H}_{3} - {C H}_{2} O H

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C I - {C H}_{2} - {C H}_{2} O H

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F_{3} C - {C H}_{2} - O H

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{C H}_{3} - C H_{3} - {C H}_{2} O H

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Solution

The correct option is D ${C H}_{3} - C H_{3} - {C H}_{2} O H$
D is correct answer.
Its least acidic among given compounds so it is having highest $p K_{a}$ value,because $p K_{a} α 1 / K_{a}$ .
Because of more electron donating groups attached this alcohol is least acidic.

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