Arrange the following in order of increasing acidity:
(i) Propanoic acid, chloroethanoic acid, 3-bromo-propanoic acid and trichloroacetic acid.
(ii) 2-Fluorobutanoic acid, 2-iodobutanoic acid, 2-bromobutanoic acid and butanoic acid.
(iii) (iii) Acetic acid, 2-methyl propanoic acid, 2,2-dimethyl propanoic acid.
(iv) Oxalic acid, malonic acid, succinic acid, glutaric acid.
(v) `C_(6)H_(5)COOH, p-OHC_(6)H_(4)COOH,`
`p-CH_(3)C_(6)H_(4)COOH, p-CIC_(6)H_(4)COOH,`
`p-BrC_(6)H_(4)COOH, p-NO_(2)C_(6)H_(4)COOH.`
