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AP EAMCET · Chemistry · General Organic Chemistry

Identify the correct set from the following
Compound \(p K_a \quad\) Compound \(p K_a\)

  1. A \(m\)-nitrophenol 10.2
  2. B o-nitrophenol 10.2
  3. C \(m\)-nitrophenol 7.2
  4. D o-nitrophenol 7.2
Verified Solution

Answer & Solution

Correct Answer

(D) o-nitrophenol 7.2

Step-by-step Solution

Detailed explanation

In \(o\)-nitrophenol there is intramolecular \(\mathrm{H}\)-bonding, since \(-\mathrm{NO}_2\) group is very close to - \(\mathrm{OH}\) group. Thus, proton can not be easily released from \(o\)-nitrophenol as compared to para and meta. Thus, \(\mathrm{p} K_a\) is least.
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