Which of the following reaction is possible ?

Which of the following reactions is possible ?

Which of the following reactions is possible ?

Which of the following reactions is possible ?

Which of the following reactions is possible ?

Which of the following reactions is possible? ZnSO_4(aq)+Cu(s)rarrCuSO_4(aq)+Zn(s)

Which of the following reactions is possible? Zn(s)+CuSO_4(aq)rarrZnSO_4(aq)+Cu(s)

Which of the following reaction are possible ? (1) ArN_(2)^(+) + CuBr rarr Ar -Br (2) (3) ArN_(2)^(+) + H_(3)PO_(2) overset(H_(2)O)rarr ArH (4) ArN_(2)^(+) + I^(-) rarr ArI Select the answer using codes given below: