Which one of the chemical reactions is incorrect? (i) \[Fe\,S{{O}_{4}}+Zn\to Zn\,S{{O}_{4}}+Fe\] (ii) \[Zn\,S{{O}_{4}}+Fe\to Fe\,S{{O}_{4}}+Zn\] (iii) \[2Au+2HCl\to 2Au\,\,Cl+{{H}_{2}}\] (iv) \[Mg+Cu\,S{{O}_{4}}\to Mg\,S{{O}_{4}}+Cu\]

• A. (i) and (ii)                      
• B. (ii) and (iii)
• C. (iii) and (iv)                   
• D. (i) and (iv)
• E. None of these