The $p K_{a}$ , of phenol is 9.2. Predict which of the following $p K_{a}$ values given below is most consistent for the $p K_{a}$ of para-hydroxy benzaldehyde ?

10.4

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8.6

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4.8

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Insufficient Information

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Solution

The correct option is B 8.6
$- C H O$ at the para position will increase acid strength hence $p K_{a}$ will be lowered but not as Much as to reach 4.8.

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