JEE Advanced 2020 — Paper 1 — Question 22

(A) $\mathrm{HClO}<\mathrm{HClO}_{3}<\mathrm{HClO}_{4}$ (increasing acidic character)

$\mathrm{So}, \mathrm{ClO}^{-}$is the strongest conjugate base.

(B) Only $\mathrm{Cl}_{-} \mathrm{O}^{-}$and $\mathrm{ClO}_{3}^{-}$has lone pair of electrons on Cl -atom. $\mathrm{But} \mathrm{Cl}-\mathrm{O}^{-}$is always linear ion as it is

diatomic, so, no effect of lone pair on shape but in $\mathrm{ClO}_{3}^{-}$due the lone pair on Cl shape becomes pyramidal.

(C) $\mathrm{ClO}^{-} \longrightarrow \mathrm{Cl}^{-}+\mathrm{ClO}_{3}^{-}$

$\mathrm{ClO}_{3}^{-} \longrightarrow \mathrm{Cl}^{-}+\mathrm{ClO}_{4}^{-}$(No same set of ions)

(D) $\mathrm{ClO}^{-}+\mathrm{SO}_{3}^{2-} \longrightarrow \mathrm{Cl}^{-}+\mathrm{SO}_{4}^{2-}$