MCQ
Among the following which one is most basic?
- A$\ce{NH_3}$
- B$\ce{CH_3NH_2}$
- ✓$\ce{CH_3CH_2NH_2}$
- D$\ce{C_6H_5NH_2}$
✓
Answer
Correct option: C.
$\ce{CH_3CH_2NH_2}$
The basicity of the among compounds is due to the presence of lone pair on Nitrogen.
$\ce{CH_3CH_2NH_2}$ is more basic than $\ce{NH_3}$ because of electron$-$donating group in $\ce{CH_3CH_2NH_2}$ increases the electron density on nitrogen atom.
$\ce{CH_3NH_2}$ is less basic than $\ce{CH_3CH_2NH_2}$ because of ethyl group present in ethylamine which increases electron density on $N$ in ethylamine and attracts $H^+$ better than methylamine.
$\ce{C_6H_5NH_2}$ is less basic than ethylamine because in $\ce{C_6H_5NH_2}$ the lone pair of electron on nitrogen is less available for protonation. It is delocalised into the Benzene ring by resonance.
In ethylamine no such delocalisation takes place.
Hence, among them $\ce{CH_3CH_2NH_2}$ is most basic.
$\ce{CH_3CH_2NH_2}$ is more basic than $\ce{NH_3}$ because of electron$-$donating group in $\ce{CH_3CH_2NH_2}$ increases the electron density on nitrogen atom.
$\ce{CH_3NH_2}$ is less basic than $\ce{CH_3CH_2NH_2}$ because of ethyl group present in ethylamine which increases electron density on $N$ in ethylamine and attracts $H^+$ better than methylamine.
$\ce{C_6H_5NH_2}$ is less basic than ethylamine because in $\ce{C_6H_5NH_2}$ the lone pair of electron on nitrogen is less available for protonation. It is delocalised into the Benzene ring by resonance.
In ethylamine no such delocalisation takes place.
Hence, among them $\ce{CH_3CH_2NH_2}$ is most basic.
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