AP EAMCET · Chemistry · General Organic Chemistry
Identify the correct set from the following
Compound \(p K_a \quad\) Compound \(p K_a\)
- A \(m\)-nitrophenol 10.2
- B o-nitrophenol 10.2
- C \(m\)-nitrophenol 7.2
- D o-nitrophenol 7.2
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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