Question:
The one which is least basic is
The one which is least basic is
Show Hint
More resonance delocalisation of nitrogen lone pair decreases basicity. Triphenylamine has maximum delocalisation, hence least basic.
Updated On: Jan 3, 2026
- \(NH_3\)
- \(C_6H_5NH_2\)
- \((C_6H_5)_3N\)
- \((C_6H_5)_2NH\)
Hide Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Basicity depends on availability of lone pair.
More available lone pair \(\Rightarrow\) stronger base.
Step 2: Compare aromatic amines.
In aniline and its derivatives, lone pair on nitrogen delocalizes into benzene ring by resonance, reducing basicity.
Step 3: Triphenylamine case.
In \((C_6H_5)_3N\), lone pair is delocalized into three phenyl rings.
So resonance withdrawal is maximum and lone pair becomes least available for protonation.
Hence it is least basic.
Final Answer: \[ \boxed{(C_6H_5)_3N} \]
More available lone pair \(\Rightarrow\) stronger base.
Step 2: Compare aromatic amines.
In aniline and its derivatives, lone pair on nitrogen delocalizes into benzene ring by resonance, reducing basicity.
Step 3: Triphenylamine case.
In \((C_6H_5)_3N\), lone pair is delocalized into three phenyl rings.
So resonance withdrawal is maximum and lone pair becomes least available for protonation.
Hence it is least basic.
Final Answer: \[ \boxed{(C_6H_5)_3N} \]
Was this answer helpful?
0
0
Top Questions on Amines
- Why is aniline less basic than ethylamine ?
- Explain why methylamine is a stronger base than Ammonia ?
- Hoffmann Bromamide degradation reaction is given by:
- An amine 'X' reacts with Hinsberg reagent and the product obtained is soluble in alkali. The amine 'X' is:
- Arrange the following compounds as asked:
(a) In decreasing order of pKb, values: C$_6$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH, C$_6$H$_5$NHCH$_2$CH$_3$, C$_6$H$_5$NH$_3$
(b) Increasing order of boiling point: C$_6$H$_5$OH, C$_2$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH, C$_6$H$_5$NH$_2$
(c) Increasing order of solubility in water: C$_6$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH, C$_6$H$_5$NHCH$_2$CH$_3$
View More Questions
Questions Asked in VITEEE exam
- The coordination number and geometry of \([\mathrm{Ni(CN)_4]^{2-}\) and \([\mathrm{NiCl_4}]^{2-}\) are respectively:}
- VITEEE - 2025
- coordination compounds
- The IUPAC name of \([\mathrm{Co(NH_3)_5Cl}]\mathrm{SO_4}\) is:
- VITEEE - 2025
- coordination compounds
- Which of the following compounds will show geometrical isomerism?
- VITEEE - 2025
- coordination compounds
- Which of the following is a characteristic property of acids?
- VITEEE - 2025
- Acids and Bases
- Which of the following is an example of an exothermic reaction?
- VITEEE - 2025
- Acids and Bases
View More Questions