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  • The increasing order of pKb for the following compounds will be: Option: 1 (b)<(c)<(a)<b

The increasing order of pKb for the following compounds will be:
Option: 1 (b)<(c)<(a)
Option: 2(c)<(a)<(b)
Option: 3 (b)<(c)<(a)
Option: 4 (c) > (a) > (b) 
 

Answers (1)

best_answer

As we have learnt,

pK_b=-\log k_b
So, as K_b increases, pK_b decreases.

The conjugate acid of guanidine is most resonance stabilized followed by imidine.

Thus, the increasing order of basicity is: 
(b) > (a) > (c) 

pKb order is given as:

(c) > (a) > (b)

Therefore, Option(4) is correct.

Posted by

Kuldeep Maurya

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