The decreasing order of basic character of the three amines and ammonia is :

N H_{3} > C H_{3} N H_{2} > C_{2} H_{5} N H_{2} > C_{6} H_{5} N H_{2}

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C_{2} H_{5} N H_{2} > C H_{3} N H_{2} > N H_{3} > C_{6} H_{5} N H_{2}

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C_{6} H_{5} N H_{2} > C_{2} H_{5} N H_{2} > C H_{3} N H_{2} > N H_{3}

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C H_{3} N H_{2} > C_{2} H_{5} N H_{2} > C_{6} H_{5} N H_{2} > N H_{3}

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Solution

The correct option is C $C_{2} H_{5} N H_{2} > C H_{3} N H_{2} > N H_{3} > C_{6} H_{5} N H_{2}$
(i) Electron donors are bases.
(ii) Electron withdrawing groups (eg, benzyl) decrease the basicity of amines.
(iii) Electron donating groups (eg, alkyl) increase the acidity of amines.
$∴$ The correct order of basicity of amines in
$C_{2} H_{5} N H_{2} > C H_{3} N H_{2} > N H_{3} > C_{6} H_{5} N H_{2}$

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Similar questions

Arrange the following in increasing order of their basic strength:

(i) C₂H₅NH₂, C₆H₅NH₂, NH₃, C₆H₅CH₂NH₂ and (C₂H₅)₂NH

(ii) C₂H₅NH₂, (C₂H₅)₂NH, (C₂H₅)₃N, C₆H₅NH₂

(iii) CH₃NH₂, (CH₃)₂NH, (CH₃)₃N, C₆H₅NH₂, C₆H₅CH₂NH₂.

C_{6} H_{5} N H_{2}, C_{2} H_{5} N H_{2}, (C_{2} H_{5})_{2} N H, N H_{3}

C H_{3} N H_{2}, (C H_{3})_{2} N H, N H_{3}, C_{6} H_{5} N H_{2}

p K_{b}

C_{2} H_{5} N H_{2}, C_{6} H_{5} N H C H_{3}, (C_{2} H_{5})_{2} N H

C_{6} H_{5} N H_{2}

C_{6} H_{5} N H_{2}, C_{6} H_{5} N (C H_{3})_{2}, (C_{2} H_{5})_{2} N H

C H_{3} N H_{2}

C_{2} H_{5} N H_{2}, C_{6} H_{5} N H_{2}, N H_{3}, C_{6} H_{5} C H_{2} N H_{2}

(C_{2} H_{5})_{2} N H

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