In the presence of moisture,$SO_2$ can

Which of the following hydrides of Group $16$ elements has the highest reducing property?

Which one of the following is most acidic?

Which of the following molecules exhibits the highest acidic nature?

Which of the following statements is correct regarding the oxygen family (Group $16$)?
$(i)$ The stability of $+6$ oxidation state decreases down the group and the stability of $+4$ oxidation state increases down the group.
$(ii)$ The stability of $+6$ oxidation state increases down the group and the stability of $+4$ oxidation state decreases down the group.
$(iii)$ Bonding in $+4$ and $+6$ oxidation states is primarily covalent.

Select the correct statement.