First slide

Basic Strength

Question

Correct increasing order of $K_{b}$ values for $A = C_{2} H_{5} N H_{2}; B = {(C_{2} H_{5})}_{2} N H; C = {(C_{2} H_{5})}_{3} N; D = C_{6} H_{5} C H_{2} N H_{2}$

Moderate

A

A, B, C, D
B

D, C, B, A
C

D, A, C, B
D

D, A, B, C

Solution

In aqueous solution $K_{b} \propto [O H^{-}]$
$k_{b}$ value depends on cumulative effect of inductive effect, H–bonding and steric factors.
$K_{b}$ of $\begin{array}{l} {(C_{2} H_{5})}_{2} N H > {(C_{2} H_{5})}_{3} N > C_{2} H_{5} N H_{2} > C_{6} H_{5} - C H_{2} N H_{2} \\ B C A D \end{array}$
Increasing order will be D, A, C, B

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