The order of basic strength of the following in aqueous solution is
${NH}_{3}, C_{2} H_{5} {NH}_{2}, {(C_{2} H_{5})}_{2} NH, {(C_{2} H_{5})}_{3} N$

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${(C_{2} H_{5})}_{3} N > {(C_{2} H_{5})}_{2} NH > C_{2} H_{5} {NH}_{2} > {NH}_{3}$

${(C_{2} H_{5})}_{2} NH > {(C_{2} H_{5})}_{3} N > C_{2} H_{5} {NH}_{2} > {NH}_{3}$

${(C_{2} H_{5})}_{3} N > C_{2} H_{5} {NH}_{2} > {(C_{2} H_{5})}_{2} NH > {NH}_{3}$

${NH}_{3} > H_{2} {NC}_{2} H_{5} > N {(C_{2} H_{5})}_{3} > HN {(C_{2} H_{5})}_{2}$

answer is B.

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Detailed Solution

Aliphatic amines are stronger bases than ammonia because of inductive effect. Due to steric factors tertiary amines are less basic than primary amines. So, the order of basic strength

${(C_{2} H_{5})}_{2} NH > {(C_{2} H_{5})}_{3} N > C_{2} H_{5} {NH}_{2} > {NH}_{3}$

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