Which of the Following Compounds Is the Strongest Acid A) I
B) II
C) III
D) IV

Which of the following compounds is the strongest acid? $$\begin{array} { l } \mathrm { CH } _ { 4 }&\mathrm { CH } _ { 3 } \mathrm { CH } _ { 3 }&\mathrm { H } _ { 2 } \mathrm { C } = \mathrm { CH } _ { 2 }&\mathrm { HC } \equiv \mathrm { CH }\\\text { I }&\text { II } &\text { III } &\text { IV } \\\end{array}$$

A) I
B) II
C) III
D) IV