Question:
The correct order of basic nature on aqueous solution for the bases \( \text{NH}_3 \), \( \text{NH}_2 \), \( \text{CH}_3 \text{NH}_2 \), \( \text{CH}_3 \text{CH}_2 \text{NH}_2 \), \( (\text{CH}_3 \text{CH}_2)_2 \text{NH} \) is:
The correct order of basic nature on aqueous solution for the bases \( \text{NH}_3 \), \( \text{NH}_2 \), \( \text{CH}_3 \text{NH}_2 \), \( \text{CH}_3 \text{CH}_2 \text{NH}_2 \), \( (\text{CH}_3 \text{CH}_2)_2 \text{NH} \) is:
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The presence of alkyl groups enhances basic strength due to the electron-donating effect, but the bulkier groups like \( (\text{CH}_3 \text{CH}_2)_2 \text{NH} \) decrease the basicity due to steric hindrance and reduced availability of the lone pair.
Updated On: Apr 27, 2025
- \( \text{NH}_3>\text{NH}_2>\text{CH}_3 \text{NH}_2>\text{CH}_3 \text{CH}_2 \text{NH}_2>(\text{CH}_3 \text{CH}_2)_2 \text{NH} \)
- \( \text{NH}_2>\text{NH}_3>\text{CH}_3 \text{NH}_2>\text{CH}_3 \text{CH}_2 \text{NH}_2>(\text{CH}_3 \text{CH}_2)_2 \text{NH} \)
- \( \text{NH}_3>\text{CH}_3 \text{NH}_2>\text{NH}_2>\text{CH}_3 \text{CH}_2 \text{NH}_2>(\text{CH}_3 \text{CH}_2)_2 \text{NH} \)
- \( \text{NH}_3>\text{CH}_3 \text{CH}_2 \text{NH}_2>\text{NH}_2>\text{CH}_3 \text{NH}_2>(\text{CH}_3 \text{CH}_2)_2 \text{NH} \)
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The Correct Option is D
Solution and Explanation
Basic strength of amines depends on hydrogen bonding and electronic inductive effect. Thus, the correct order is:
\[
\text{NH}_3>\text{NH}_2>\text{CH}_3 \text{NH}_2>\text{CH}_3 \text{CH}_2 \text{NH}_2>(\text{CH}_3 \text{CH}_2)_2 \text{NH}
\]
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