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Question:

The strongest acid amongst the following compounds is: CH3COOH, HCOOH, CH3CH2CH(Cl)COOH, ClCH2CH2CH2COOH

CH3COOH

HCOOH

CH3CH2CH(Cl)COOH

ClCH2CH2CH2COOH

Solution:

Presence of one −I effect chlorine at α-carbon increases the acid strength significantly. Hence, Option(C) is the correct answer.