Explain the orders of acidity of carboxylic acids:
(1) `Cl_(3)C COOHgtCI_(2)CHCOOHgtClCH_(2)COOH`
(2) `CH_(3)CH_(2)COOHgt(CH_(3))_(2)CHCOOHgt(CH_(3))_(3)C COOH`

Explanation

(1) - I effect explains this order of acid strenght. As the number of halogen atoms on the `alpha` - carbon decrease, the overall - I effect decreases and as a consequence, the acid strenght decreases.

(2) + I effect explains the given order of acid strenght. As the number of methyl groups attached to the `alpha` - carbon atom consequently, the acid strenght decreases.