Order of decreasing acidity of the following is
(I) HCOOH
(II) CH3COOH
(III) Cl2CHCOOH
(IV) CF3COOH
IV III II I
IV III I II
III IV II I
I IV II III
Acidity α - I effect
Order of decreasing acidity of
(i) HCOOH (ii)CH3COOH (iii)Cl2CHCOOH (iv)CF3COOH is