Which of the following elements exhibits the most basic character?

Which of the given methods cannot produce $Cl_2$?

Which is the incorrect order?

In which of the following is gold soluble?

$O_2$ is formed in the hydrolysis of:

Consider the following reactions :
$(i)$ $F_2 + 2X^{-} \to 2F^{-} + X_2$ $(X = Cl, Br, I)$
$(ii)$ $Cl_2 + 2X^{-} \to 2Cl^{-} + X_2$ $(X = Br, I)$
$(iii)$ $I_2 + 2Br^{-} \to 2I^{-} + Br_2$
Which option has only the correct set of reactions?