MHT CET · Chemistry · Ionic Equilibrium
Which among the following amines has highest value of \(\mathrm{pK}_{\mathrm{b}}\) ?
- A \(\left(\mathrm{CH}_3\right)_2 \mathrm{NH}\)
- B \(\left(\mathrm{CH}_3\right)_3 \mathrm{~N}\)
- C \(\mathrm{CH}_3 \mathrm{NH}_2\)
- D \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2\)
Answer & Solution
Correct Answer
(D) \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2\)
Step-by-step Solution
Detailed explanation
\(\mathrm{pK}_{\mathrm{b}}\) order: \( \mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2 \) > \( \left(\mathrm{CH}_3\right)_3 \mathrm{~N} \) > \( \mathrm{CH}_3 \mathrm{NH}_2 \) > \( \left(\mathrm{CH}_3\right)_2 \mathrm{NH} \) Highest \( \mathrm{pK}_{\mathrm{b}} \): \( \mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2 \)
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