1.

(1) para fluorobenzoic acid  (2) para chlorobenzoic acid. Explain with reason.

Answer»

para chlorobenzoic acid is stronger than para fluorobenzoic acid.

Explanation:

We know that Halogens exert both -I and +R effects.  -I effect increases the acid strength while +R effect decreases the acid strength of a carboxylic acid. In the case of para fluorobenzoic  acid, the +R effect dominates over the -I effect. Due to which para fluorobenzoic acid is weaker than para chlorobenzoic acid.



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