Acidic Strength of Carbonyl Functional Groups

The correct order of decreasing acidic strength of oxy acids of group 15 elements :

Formic acid contains the following functional groups :

The correct increasing order of acidic strength of oxyacids of group 15 elements is

The correct order of decreasing acidic strength of oxyacids of group 15 elements is

Based on different functional (R) groups the following amino acids are formed. Select the correct amino acid according to different functional groups.