Basicity order of the following amines in aqueous medium
i) N-Methylaniline i
i) N, N-Dimethylaniline
iii) Aniline
Basicity order of the following amines in aqueous medium
i) N-Methylaniline i
i) N, N-Dimethylaniline
iii) Aniline
Show Hint
- i $\displaystyle >$ ii $\displaystyle >$ iii
- i $\displaystyle >$ iii $\displaystyle >$ ii
- iii $\displaystyle >$ ii $\displaystyle >$ i
- ii $\displaystyle >$ i $\displaystyle >$ iii
The Correct Option is D
Solution and Explanation
In aqueous medium, the electron-donating groups (such as alkyl groups) attached to the nitrogen atom increase the basicity of the amine.
In this case, N, N-Dimethylaniline (ii) has the highest basicity, followed by N-Methylaniline (i), and Aniline (iii) with the lowest basicity.
The presence of two methyl groups on the nitrogen in N, N-Dimethylaniline makes it more basic than N-Methylaniline, which has only one methyl group. Aniline has the least basicity due to the lack of any alkyl groups on the nitrogen.
Top Questions on Amines
Amines are usually formed from amides, imides, halides, nitro compounds, etc. They exhibit hydrogen bonding which influences their physical properties. In alkyl amines, a combination of electron releasing, steric and H-bonding factors influence the stability of the substituted ammonium cations in protic polar solvents and thus affect the basic nature of amines. Alkyl amines are found to be stronger bases than ammonia. Amines being basic in nature, react with acids to form salts. Aryldiazonium salts, undergo replacement of the diazonium group with a variety of nucleophiles to produce aryl halides, cyanides, phenols and arenes.
How can you convert the following:
(i) Ethanoic acid to methanamineWhich of the following amine(s) show(s) positive carbamylamine test?
- Identify correct statements: (A) Primary amines do not give diazonium salts when treated with \({NaNO}_2\) in acidic condition.
(B) Aliphatic and aromatic primary amines on heating with \({CHCl}_3\) and ethanolic \({KOH}\) form carbylamines.
(C) Secondary and tertiary amines also give carbylamine test.
(D) Benzenesulfonyl chloride is known as Hinsberg’s reagent.
(E) Tertiary amines react with benzenesulfonyl chloride very easily.
Choose the correct answer from the options given below: - Write short notes on the following:
(i) Carbylamine reaction
(ii) Hofmann–bromamide reaction
(iii) Diazotisation - The purification method based on the following physical transformation is: \[ {Solid} \xrightarrow{{Heat}} {Vapour} \xrightarrow{{Cool}} {Solid} \]
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