Which one of the following is the weakest base?

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

$C_{2} H_{5} N H_{2}$

$N H_{3}$

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

answer is D.

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Detailed Solution

In NH₃ , there is no E.D.G. attached to N.

Basicity depends on the negative charge on the nitrogen atom or electron density. With an increase in the -ve charge on the nitrogen atom, the basicity of the amines increases. Basicity depends on charge density. Basicity decreases with a decrease in charge density.Resonance and inductive effects decrease the basicity of an amine. Plus I effect will increase the basicity.

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