Based on VSEPR model, match the xenon compounds given in List-I with the corresponding geometries and the number of lone pairs on xenon given in List-II and choose the correct option.
List I
List II
(P) XeF2 (1) Trigonal bipyramidal and two lone pair of electrons (Q) XeF4 (2) Tetrahedral and one lone pair of electrons (R) XeO3 (3) Octahedral and two lone pair of electrons (S) XeO3F2 (4) Trigonal bipyramidal and no lone pair of electrons (5) Trigonal bipyramidal and three lone pair of electrons
List I | List II | ||
| (P) | XeF2 | (1) | Trigonal bipyramidal and two lone pair of electrons |
| (Q) | XeF4 | (2) | Tetrahedral and one lone pair of electrons |
| (R) | XeO3 | (3) | Octahedral and two lone pair of electrons |
| (S) | XeO3F2 | (4) | Trigonal bipyramidal and no lone pair of electrons |
| (5) | Trigonal bipyramidal and three lone pair of electrons | ||
- P-5, Q-2, R-3, S-1
- P-5, Q-3, R-2, S-4
- P-4, Q-3, R-2, S-1
- P-4, Q-2, R-5, S-3
The Correct Option is B
Approach Solution - 1
Step 1: Determining the Geometry and Lone Pairs of Each Xenon Compound
- (P) XeF2
- Central atom: Xe
- Valence electrons: 8
- Bonding pairs: 2 (due to 2 F atoms)
- Lone pairs: \( 8 - 2 = 6 \) (3 lone pairs)
- Geometry: Trigonal bipyramidal (linear shape due to lone pairs in equatorial positions)
- Matches: (5)
- (Q) XeF4
- Central atom: Xe
- Valence electrons: 8
- Bonding pairs: 4 (due to 4 F atoms)
- Lone pairs: \( 8 - 4 = 4 \) (2 lone pairs)
- Geometry: Octahedral (square planar shape due to lone pairs at axial positions)
- Matches: (3)
- (R) XeO3
- Central atom: Xe
- Valence electrons: 8
- Bonding pairs: 3 (due to 3 O atoms)
- Lone pairs: \( 8 - 3 = 5 \) (1 lone pair)
- Geometry: Tetrahedral (pyramidal shape due to lone pair)
- Matches: (2)
- (S) XeOF4
- Central atom: Xe
- Valence electrons: 8
- Bonding pairs: 5 (3 O atoms and 2 F atoms)
- Lone pairs: \( 8 - 5 = 3 \) (0 lone pairs)
- Geometry: Trigonal bipyramidal (no lone pairs present)
- Matches: (4)
Step 2: Conclusion
- (P) → (5)
- (Q) → (3)
- (R) → (2)
- (S) → (4)
Thus, the correct answer is (B) P-5, Q-3, R-2, S-4.
Approach Solution -2
To solve the problem, we need to use the VSEPR model to determine the molecular geometries and lone pairs on xenon compounds and match them with the given options.
1. Xenon Difluoride (XeF2):
- Total electron pairs: 5 (2 bonding pairs, 3 lone pairs)
- Geometry: Trigonal bipyramidal
- Lone pairs: 3
- Corresponds to option (5) "Trigonal bipyramidal and three lone pairs".
2. Xenon Tetrafluoride (XeF4):
- Total electron pairs: 6 (4 bonding pairs, 2 lone pairs)
- Geometry: Octahedral
- Lone pairs: 2
- Corresponds to option (3) "Octahedral and two lone pairs".
3. Xenon Trioxide (XeO3):
- Total electron pairs: 4 (3 bonding pairs, 1 lone pair)
- Geometry: Tetrahedral
- Lone pairs: 1
- Corresponds to option (2) "Tetrahedral and one lone pair".
4. Xenon Oxyfluoride (XeO3F2):
- Total electron pairs: 5 (5 bonding pairs, 0 lone pairs)
- Geometry: Trigonal bipyramidal
- Lone pairs: 0
- Corresponds to option (4) "Trigonal bipyramidal and no lone pairs".
Final Matching:
P - 5, Q - 3, R - 2, S - 4
Final Answer:
Option (B)
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