According to VSEPR theory the shapes of [SF₂Cl]⁺ and [S₂O₄]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 $[\mathrm{SF_2Cl}]^{+}$ and $[\mathrm{S_2O_4}]^{2-}$ should be
(a)trigonal planar for $[\mathrm{S_2O_4}]^{2-}$ and trigonal pyramidal for $[\mathrm{SF_2Cl}]^{+}$
(b)both trigonal planar
(c)trigonal pyramidal for $[\mathrm{S_2O_4}]^{2-}$ and trigonal planar for $[\mathrm{SF_2Cl}]^{+}$
(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).