JEE MAIN - Chemistry (2023 - 25th January Morning Shift - No. 12)
The correct order in aqueous medium of basic strength in case of methyl substituted amines is :
$$\mathrm{NH_3 > Me_3N > MeNH_2 > Me_2NH}$$
$$\mathrm{Me_3N > Me_2NH > MeNH_2 > NH_3}$$
$$\mathrm{Me_2NH > MeNH_2 > Me_3N > NH_3}$$
$$\mathrm{Me_2NH > Me_3N > MeNH_2 > NH_3}$$
Explanation
In aqueous medium basic strength is dependent on electron density on nitrogen as well as solvation of cation formed after accepting $\mathrm{H}^{+}$. After considering all these factors overall basic strength order is
$$ \mathrm{Me}_2 \mathrm{NH}>\mathrm{MeNH}_2>\mathrm{Me}_3 \mathrm{N}>\mathrm{NH}_3 $$
$$ \mathrm{Me}_2 \mathrm{NH}>\mathrm{MeNH}_2>\mathrm{Me}_3 \mathrm{N}>\mathrm{NH}_3 $$
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