Answer :

+I effect donates e- . Br group will show +I effect along the chain but as I effect is distance dependent effect it will die as the distance increase.+I effect of alkyl group will reduce the acidity of a compound whereas –I effect will increase the acidity,I effects are distance dependent, correct order will be (CH3)2CHCOOH< CH3CH2CH2COOH< CH3CH(Br)CH2COOH < CH3CH2CH(Br)COOH.

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