All of the following are diprotic acid except--?

A) H2CO3
B) H2SO4
D) HCl
E) B and C

HCl >> H+ + Cl- is not a diprotic acid
also acetic acid CH3COOH <> CH3COO- + H+ is not a diprotic acid.

H2CO3 <> H+ + HCO3-
HCO3- <> H+ + CO32- is a diprotic acid

H2SO4 >> H+ + HSO4-
HSO4- <> H+ + SO42- is a diprotic acid
actually it's C and D (acetic acid and hydrochloric acid)
acid has the tendency to give proton in its solution with water. if any acid gives two prtons it will be diprotic acid and if it gives one proton it will be monoprotic acid. here HCl and CH3COOH give one proton so these are monoprotic and H2SO4 and H2CO3 give two protons and these are diprotic acids.
A diprotic acid is an acid that yields two H+ ions per acid molecule. Examples of diprotic acids are sulfuric acid, H2SO4, and carbonic acid, H2CO3. A diprotic acid dissociates in water in two stages:

(1) H2X(aq) H+(aq) + HX-(aq)

(2) HX-(aq) H+(aq) + X2-(aq)

H2SO4= Sulfuric Acid
H2CO3= Carbonic Acid
CH3COOH= Acetic Acid
HCL=Hydrochloric Acid

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