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Which molecule has trigonal planar geome...

Which molecule has trigonal planar geometry ?

A

`NH_(3)`

B

`BF_(3)`

C

`PCl_(3)`

D

`IF_(3)`

Text Solution

AI Generated Solution

The correct Answer is:
To determine which molecule has a trigonal planar geometry, we will analyze the given molecules: ammonia (NH3), boron trifluoride (BF3), phosphorus trifluoride (PCl3), and iodine trifluoride (IF3). ### Step-by-Step Solution: 1. **Identify the molecular structures and hybridization:** - **Ammonia (NH3):** - Nitrogen has 5 valence electrons, forms 3 bonds with hydrogen, and has 1 lone pair. - Hybridization: sp³ (due to 4 regions of electron density: 3 bonds + 1 lone pair). - Geometry: Pyramidal (not trigonal planar). - **Boron Trifluoride (BF3):** - Boron has 3 valence electrons and forms 3 bonds with fluorine, with no lone pairs. - Hybridization: sp² (due to 3 regions of electron density: 3 bonds). - Geometry: Trigonal planar. - **Phosphorus Trifluoride (PCl3):** - Phosphorus has 5 valence electrons, forms 3 bonds with chlorine, and has 1 lone pair. - Hybridization: sp³ (due to 4 regions of electron density: 3 bonds + 1 lone pair). - Geometry: Pyramidal (not trigonal planar). - **Iodine Trifluoride (IF3):** - Iodine has 7 valence electrons, forms 3 bonds with fluorine, and has 2 lone pairs. - Hybridization: sp³d (due to 5 regions of electron density: 3 bonds + 2 lone pairs). - Geometry: T-shaped (not trigonal planar). 2. **Conclusion:** - Among the molecules analyzed, only **boron trifluoride (BF3)** has a trigonal planar geometry. ### Final Answer: The molecule with trigonal planar geometry is **Boron Trifluoride (BF3)**.
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