I need help on this one too I think it might be (b)
1,6,1,2 that should be the answer
Answer :
(a) The overall equation is:

(b) The intermediates are :

Explanation :
<u>Part (a) :</u>
(1)
(fast)
(2)
(slow)
(3)
(fast)
By adding the three equations and cancelling the common terms on both side, we will get the overall equation.

<u>Part (b) :</u>
Intermediates are generated and consumed in the mechanism and do not include in the overall equation.
Since, intermediates will not include in the overall mechanism.
The intermediates are :
