JEE Main 2025 · Chemistry · Carbonyl Compounds, Carboxylic Acids and Amines · easy

In aqueous solution the correct order of basic strength of ethylamine, diethylamine, triethylamine and ammonia is

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Answer: (B) $\mathrm{Et_2NH > Et_3N > EtNH_2 > NH_3}$

In water the basicity of alkylamines depends on the

+I

effect, solvation (hydrogen bonding) of the conjugate ammonium ion and steric hindrance. For ethyl groups the experimental

pK_b

values are about

3.0

for

\mathrm{Et_2NH}

3.25

for

\mathrm{Et_3N}

3.35

for

\mathrm{EtNH_2}

and

4.75

for

\mathrm{NH_3}

. Hence

\mathrm{Et_2NH > Et_3N > EtNH_2 > NH_3}

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