The strongest acid of the following is indicated by the Roman numeral ______. $\begin{array}{ccccc}&&&\mathrm{Br}\
&&&|\
\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH} & \mathrm{BrCH}_{2} \mathrm{CH}_{2} \mathrm{COOH} & \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}& \mathrm{CH}_{3} \mathrm{CHCOOH}\I&II&III&IV
\end{array}$

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The Answer of The strongest acid of the following is indicated by the Roman numeral ______. $\begin{array}{ccccc}&&&\mathrm{Br}\
&&&|\
\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COOH} & \mathrm{BrCH}_{2} \mathrm{CH}_{2} \mathrm{COOH} & \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}& \mathrm{CH}_{3} \mathrm{CHCOOH}\I&II&III&IV
\end{array}$

The Strongest Acid of the Following Is Indicated by the Roman