1. Tardigrade
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  3. Chemistry
  4. The pKa of phenol is 9.2. Predict which of the following pKa values given below is most consistent for the pKa of para- hydroxy benzaldehyde?

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

ManipalManipal 2014

Solution:

- $CHO$ at the para position will increase acid strength hence $pK _{ a }$ will be lowered but not as Much as to reach $4.8$.