In how many of the following the first one is more acidic than second one.(1) (I) o -methyl benzoic acid ;(II) benzoic acid(2) (I) o-methyl benzoic acid ;(II) o - hydroxy benzoic acid(3) (I) m -chloro phenol ; (II) p -chloro phenol(4) (I) p -chloro phenol ; (II) p - floro phenol(5) (I) Phenol ; (II) Acetic acid(6) (I) Formic acid ;(II) Benzoic acid(7) (I) Benzoic acid; (II) Acetic acid (8) (I)Phenol; (II) Carbonic acid(9) (I) Acetic acid (II) Carbonic acid