Arrange the following in the decreasing order of `pK_b` values I. `C_2H_5NH_2` , II. `C_6H_5NHCH_3`, III. `(C_2H_5)_2NH`, IV . `C_6H_5NH_2`

Question

Arrange the following in the decreasing order of `pK_b` values I. `C_2H_5NH_2` , II. `C_6H_5NHCH_3`, III. `(C_2H_5)_2NH`, IV . `C_6H_5NH_2`

Arrange the following in the decreasing order of `pK_b` values
I. `C_2H_5NH_2` , II. `C_6H_5NHCH_3`, III. `(C_2H_5)_2NH`, IV . `C_6H_5NH_2`
A. IV gt II gt I gt III
B. IV gt II gt III lt I
C. I gt III gt IV gt II
D. I gt III gt II gt IV

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - A
Presence of electron donating methyl group increases the basicity of amines. However, `3^@` amines in aqueous solution are less basic due to steric hindrance .
Aliphatic amines are more basic than aromatic amines because in later, lone pair takes part in delocalisation, so less available for donation.
`C_6H_5NH_2 gt C_6H_5NHCH_3 gt C_2H_5NH_2 gt (C_2H_5)_2NH`.