The unfavourable electrochemical reaction among the following is:

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Problem

The unfavourable electrochemical reaction among the following is: (1)

\text{Zn}+\text{H}_2\text{SO}_4\rightarrow\text{ZnSO}_4+\text{H}_2

(2)

\text{KI}+\text{Cl}_2\rightarrow\text{KCl}+\text{I}_2

(3)

\text{KCl}+\text{I}_2\rightarrow\text{KI}+\text{ICl}

(4)

\text{Al}+3\text{HCl}\rightarrow\text{AlCl}_3+\frac{3}{2}\text{H}_2