Discussion
Consider the following species:
SOCl2, XeOF4, ClF3, ClF5, XeF5+, SO32-, XeF3+, SF4
List-I contains different molecular shapes and List-II contains total number of species with the same molecular shapes from the given species. Match each entry in List-I with the appropriate entry in List-II and choose the correct option.
| List-I | List-II |
|---|---|
| (P) See-saw | (1) one |
| (Q) T-Shaped | (2) two |
| (R) Trigonal Planar | (3) three |
| (S) Square Pyramidal | (4) four |
| (5) zero |
Answer: A
The correct match is P → 1; Q → 2; R → 5; S → 3.
Count bond pairs and lone pairs on each central atom (VSEPR):
| Species | Bond pairs, lone pairs | Shape |
|---|---|---|
| SOCl2 | 3, 1 | trigonal pyramidal |
| SO32- | 3, 1 | trigonal pyramidal |
| SF4 | 4, 1 | see-saw |
| ClF3 | 3, 2 | T-shaped |
| XeF3+ | 3, 2 | T-shaped |
| ClF5 | 5, 1 | square pyramidal |
| XeF5+ | 5, 1 | square pyramidal |
| XeOF4 | 5, 1 | square pyramidal |
So one species is see-saw (SF4), two are T-shaped (ClF3 and XeF3+), three are square pyramidal, and none is trigonal planar: SOCl2 and SO32- look like candidates but each has a lone pair on sulfur, which makes them pyramidal. Options giving trigonal planar a count of one or two make exactly that mistake.
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