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  • a)NH3,,b)RNH2,,c)R2NH and d)R3N Show the order of basic character in aqueous solution if [R=CH3 ]

a)NH3,,b)RNH2,,c)R2NH and d)R3N Show the order of basic character in aqueous solution if [R=CH3 ]

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\text { The order of basic strength is } \mathrm{NH}_{3}<\left(\mathrm{CH}_{3}\right)_{3} \mathrm{N}<\mathrm{CH}_{3} \mathrm{NH}_{2}<\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}

\\\text{Aliphatic amines are stronger bases than ammonia because of }\\(+\mathrm{I}\) \text{(inductive) effect. The alkyl groups, which are electron releasing} \\ \text{groups, increase the electron density around the nitrogen}\\ \text{thereby, increasing the availability of the lone pair of electrons to proton } \\ \text{or Lewis acids and making the amine more basic. But in tertiary}\\ \text{amines crowding of alkyl groups cover nitrogen atom from} \\\text{all sides and thus makes it unable for protonation. Due to steric} \\ \text{factors tertiary amines are less basic than primary amines.}

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