Question

Benzyne mechanism proceeds,​

Answer 1

Two mechanisms have been proposed for nucleophilic aromatic substitution, one of which involves a benzyne as the intermediate and, therefore, is called benzyne mechanism. ... Thus, for the benzyne mechanism to be operant, the medium must be very strongly basic.

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Answer 2

Answer:

Two mechanisms have been proposed for nucleophilic aromatic substitution, one of which involves a benzyne as the intermediate and, therefore, is called benzyne mechanism.

eg:

mechanism:

Step 1:

Step 2:

Step 3 :

 

Step 1 requires a very strong base.  Thus, for the benzyne mechanism to be operant, the medium must be very strongly basic.