Can someone help me with 3-D Sketch and bond angles for O3, AsF5, KrCl4, SeCL4, and CH2Cl2? Also I’m not sure if I got the Lewis Structure correct for SeCl4. Thanks!
The Correct Answer and Explanation is:
✅ 1. O₃ (Ozone)
- Lewis Structure: O=O–O with one double bond and one single bond, and a lone pair on each terminal O. The structure is resonance stabilized.
- Molecular Geometry: Bent
- Bond Angle: ~117°
- Explanation: 3 electron regions (2 bonding, 1 lone pair) around the central O leads to trigonal planar electron geometry, but the lone pair reduces the angle.
✅ 2. AsF₅ (Arsenic Pentafluoride)
- Lewis Structure: As is bonded to 5 F atoms with no lone pairs.
- Molecular Geometry: Trigonal Bipyramidal
- Bond Angles: 120° (equatorial), 90° (axial-equatorial)
- Explanation: 5 bonding pairs around As, no lone pairs → ideal geometry.
✅ 3. KrCl₄ (Krypton Tetrachloride)
- Lewis Structure: Kr surrounded by 4 Cl atoms and 2 lone pairs.
- Molecular Geometry: Square Planar
- Bond Angles: 90°
- Explanation: 6 electron regions (4 bonding, 2 lone pairs), lone pairs go opposite each other, yielding square planar shape.
✅ 4. SeCl₄ (Selenium Tetrachloride)
- Correct Lewis Structure: Se is bonded to 4 Cl atoms, and has one lone pair.
- Molecular Geometry: See-saw
- Bond Angles: ~101° and ~120°
- Explanation: 5 electron regions (4 bonding, 1 lone pair), based on trigonal bipyramidal geometry, lone pair in equatorial position distorts bond angles.
✅ 5. CH₂Cl₂ (Dichloromethane)
- Lewis Structure: Central carbon single bonded to 2 H and 2 Cl atoms.
- Molecular Geometry: Tetrahedral
- Bond Angles: ~109.5°
- Explanation: 4 bonding pairs around C, no lone pairs. Tetrahedral geometry with slight variation due to different atom sizes and electronegativity.
🔍 Summary:
| Molecule | Lewis Structure Key | Geometry | Bond Angles |
|---|---|---|---|
| O₃ | Resonance with lone pairs | Bent | ~117° |
| AsF₅ | 5 F atoms, no lone pair | Trigonal Bipyramidal | 90°, 120° |
| KrCl₄ | 4 Cl, 2 lone pairs | Square Planar | 90° |
| SeCl₄ | 4 Cl, 1 lone pair | See-saw | ~101°, ~120° |
| CH₂Cl₂ | 4 single bonds, no lone pair | Tetrahedral | ~109.5° |
