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Dear student,
The more powerful and the more the number of such substituents and the  closer they are to the carboxyl group, the greater is the inductive  effect.
The FCH2COOH > ClCH2COOH > Br CH2COOH > ICH2COOH > CH2COOH.
The electronegativity and thus the electron withdrawing power of the  halogen substituent and thus the strength of the acid decreases in the  given order.
CH3CCOOH > Cl2CHCOOH > ClCH2COOH > CH3COOH
The number of electron withdrawing chloro group and thus the acid strength decreases in this order.
CH3CH2CH(Cl)COOH > CH3CHCl CH2 COOH > ClCH2CH2CH2COOH > CH3CH2CH2 COOH
The inductive effect decreases rapidly with increasing distance from the carboxylic group and so does the acid strength.
 





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