Correct order of $p K_{a}$ is

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3 > 2 > 1

2 > 3 > 1

1 > 2 > 3

1 > 3 > 2

answer is C.

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Detailed Solution

The acidic character of alcohols is due to the polar nature of O–H bond. An electron-releasing group (–CH₃ , –C₂H₅ ) increases electron density on oxygen tending to decrease the polarity of O-H bond. This decreases the acid strength.

Hence the order of acidic nature is 1^o>2^o>3^o and $p K_{a}$ value is 1^o< 2^o < 3^o

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