According to VSEPR theory the shapes of [SF₂ Cl]⁺and [S₂ O₄]²⁻ should be · ABC26IN0322
Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: Chemical Bonding – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Easy
According to VSEPR theory the shapes of $\left[\mathrm{SF}_{2} \mathrm{Cl}\right]^{+}$and $\left[\mathrm{S}_{2} \mathrm{O}_{4}\right]^{2-}$ should be
(a)trigonal planar for $\left[\mathrm{S}_{2} \mathrm{O}_{4}\right]^{2-}$ and trigonal pyramidal for $\left[\mathrm{SF}_{2} \mathrm{Cl}\right]^{+}$
(b)both trigonal planar
(c)trigonal pyramidal for $\left[\mathrm{S}_{2} \mathrm{O}_{4}\right]^{2-}$ and trigonal planar for $\left[\mathrm{SF}_{2} \mathrm{Cl}\right]^{+}$
(d)both trigonal pyramidal
Answer
Answer: D ✓ checked by 4AB · confidence high
The source book printed A; on checking, D is correct — see the explanation.
Explanation
[SF₂Cl]⁺: S has three bonds and one lone pair (AX₃E) — trigonal pyramidal. In dithionite [S₂O₄]²⁻ each sulfur bears two O, the S–S bond and a lone pair — also trigonal pyramidal (d).