Question

# Amongst the following the strongest base in aqueous medium is:

A

${\left({\mathrm{CH}}_{3}\right)}_{2}\mathrm{NH}$

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B

${\mathrm{CH}}_{3}{\mathrm{NH}}_{2}$

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C

${\mathrm{C}}_{6}{\mathrm{H}}_{5}{\mathrm{NHCH}}_{3}$

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D

${\mathrm{NCCH}}_{2}{\mathrm{NH}}_{2}$

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Solution

## The correct option is A ${\left({\mathrm{CH}}_{3}\right)}_{2}\mathrm{NH}$Explanation for correct option:A. ${\left({\mathrm{CH}}_{3}\right)}_{2}\mathrm{NH}$Amines:Amines are Nitrogen-containing compounds.They are both aliphatic as well as aromatic in nature.Amines have nitrogen as a central metal atom which has a lone pair of electrons over it. Due to this lone pair of electron amines are basic in nature.The strength of basicity of amines depends upon the availability of lone pair electrons and resonance.The order of basicity for general amines is ${3}^{\circ }>{2}^{\circ }>1{}^{\circ }$, Due to $\left(+\mathrm{I}\right)$, electron density on nitrogen atoms increases and thereby strength of basicity also increasesThe aromatic amines are less basic than aliphatic amines as the alkyl group in aliphatic amines shows $\left(+\mathrm{I}\right)$ effect to increase the electron density. However, in the case of aromatic amine, lone pairs of electrons participate in resonance.Therefore, the secondary amine i.e. ${\left({\mathrm{CH}}_{3}\right)}_{2}\mathrm{NH}$ is the most basic in nature. Explanation for incorrect options:B. ${\mathrm{CH}}_{3}{\mathrm{NH}}_{2}$It is a primary amine that is less basic than the secondary amine.C. ${\mathrm{C}}_{6}{\mathrm{H}}_{5}{\mathrm{NHCH}}_{3}$Aromatic amine is less basic than aliphatic amine.D. ${\mathrm{NCCH}}_{2}{\mathrm{NH}}_{2}$It is a primary aliphatic amine.Hence, the correct option is A i.e. ${\left({\mathrm{CH}}_{3}\right)}_{2}\mathrm{NH}$ is the strongest base in an aqueous solution.

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