MHT CET · Chemistry · General Organic Chemistry
Which among following amines has lowest \(\mathrm{pK}_{\mathrm{b}}\) values?
- A \(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2\)
- B \(\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH}\)
- C \(\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_3 \mathrm{~N}\)
- D \(\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2\)
Answer & Solution
Correct Answer
(B) \(\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH}\)
Step-by-step Solution
Detailed explanation
\(\begin{aligned}\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH} & \Rightarrow 2^{\circ} \text { amine } \\ & \Rightarrow \text { Most basic } \\ & \Rightarrow \text { Least } \mathrm{pK}_{\mathrm{b}}\end{aligned}\)
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