Three compounds I,II, III are given

The compounds (A) and (B) respectively are

Given data : It is given to identify the compound A and B

Explanation

In organic chemistry, the prefixes ortho, meta, and para are used to denote the location of non-hydrogen substituents on a hydrocarbon ring (benzene derivative). The prefixes come from Greek words that indicate, respectively, "correct/straight," "following/after," and "similar."

Compared to the ortho- or para-intermediates, the meta carbocation intermediate is more stable. 

Hence, the correct option (C) . II, I.