Question:
Identify correct decreasing order of basic strength of amines from following.
Identify correct decreasing order of basic strength of amines from following.
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For Methyl amines: 2-1-3 (213). For Ethyl amines: 2-3-1 (231).
Updated On: Apr 30, 2026
- \( (CH_{3})_{3}N>(CH_{3})_{2}NH>CH_{3}NH_{2} \)
- \( (CH_{3})_{2}NH>CH_{3}NH_{2}>(CH_{3})_{3}N \)
- \( (CH_{3})_{2}NH>(CH_{3})_{3}N>CH_{3}NH_{2} \)
- \( CH_{3}NH_{2}>(CH_{3})_{2}NH>(CH_{3})_{3}N \)
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Factors affecting Basicity
In aqueous solution, the basicity of methyl-substituted amines is governed by three factors: Inductive effect ($+I$), Solvation effect (Hydrogen bonding), and Steric hindrance.
Step 2: Trends
- $+I$ effect: $3^\circ>2^\circ>1^\circ$ - Solvation/Steric: $1^\circ>2^\circ>3^\circ$
Step 3: Combined Effect for Methyl Amines
The experimental order for methyl-substituted amines in water is: Secondary ($2^\circ$)>Primary ($1^\circ$)>Tertiary ($3^\circ$).
Step 4: Conclusion
The order is $(CH_3)_2NH>CH_3NH_2>(CH_3)_3N$.
Final Answer:(B)
In aqueous solution, the basicity of methyl-substituted amines is governed by three factors: Inductive effect ($+I$), Solvation effect (Hydrogen bonding), and Steric hindrance.
Step 2: Trends
- $+I$ effect: $3^\circ>2^\circ>1^\circ$ - Solvation/Steric: $1^\circ>2^\circ>3^\circ$
Step 3: Combined Effect for Methyl Amines
The experimental order for methyl-substituted amines in water is: Secondary ($2^\circ$)>Primary ($1^\circ$)>Tertiary ($3^\circ$).
Step 4: Conclusion
The order is $(CH_3)_2NH>CH_3NH_2>(CH_3)_3N$.
Final Answer:(B)
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