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Match the molecules in Column I with their molecular geometries in Column II. Column I: (a) SF4 (b) BrF3 (c) BrO3(-) (d) NH4(+) Column II: (P) Tetrahedral (Q) Pyramidal (R) See-saw (S) T-shape

1. a-P, b-Q, c-R, d-S
2. a-S, b-R, c-P, d-Q
3. a-R, b-S, c-Q, d-P
4. a-Q, b-S, c-R, d-P

Correct answer: a-R, b-S, c-Q, d-P

Solution

SF4: S has 6 valence e-, forms 4 bonds, 1 lone pair → trigonal bipyramidal electron geometry → see-saw molecular shape (R). BrF3: Br has 7 valence e-, forms 3 bonds, 2 lone pairs → T-shaped molecular geometry (S). BrO3(-): Br forms 3 bonds (to O) with 1 lone pair → pyramidal geometry (Q). NH4+: N forms 4 bonds, 0 lone pairs → tetrahedral (P).

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