Please solve this problem,,.

Dear Student, Bronsted acid are the compounds which furnish H+ ions. Amongst the given compounds (1) will be the strongest bronsted acid. This is due to greater stability of the phenoxide ion formed. Phenoxide ion is also stabilized by three nitro groups attached at the ortho and para position which have -I as well as -M effect leading to further stability of the ion formed and easy cleavage of O-H bond. Regards,