#### Question

Arrange the following in increasing order of their basic strength:

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

#### Solution

Considering the inductive effect and the steric hindrance of the alkyl groups, C_{2}H_{5}NH_{2}, (C_{2 }H_{5})_{2}NH_{2,}and their basic strengths as follows:

`C_2H_5NH_2(C_2H_5)_3N<(C_2H_5)_2NH`

Again, due to the −R effect of C_{6}H_{5} group, the electron density on the N atom in C_{6}H_{5 }NH_{2} is lower than that on the N atom in C_{2}H_{5}NH_{2}. Therefore, the basicity of C_{6}H_{5}NH_{2} is lower than that of C_{2}H_{5}NH_{2}. Hence, the given compounds can be arranged in the increasing order of their basic strengths as follows:

`C_6H_5NH_2 < C_2H_5NH_2 < (C_2H_5)_3N < (C_2H_5)_2NH`

Is there an error in this question or solution?

Solution Arrange the following in increasing order of their basic strength: C2H5NH2, (C2H5)2NH, (C2H5)3N, C6H5NH2 Concept: Physical Properties of Amines.