Q. Which one of the following is strongest acid

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Solution:

As magnitude of -I effect decreases with distance so acidic nature also decreases.

Here 2-chloropentanoic acid is most acidic while 5-chloropentanoic acid is least acidic.

2-chloropentanoic acid > 3-chloropentanoic acid > 4-chloropentanoic acid > 5-chloropentanoic acid