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Question

Which of the following has a trigonal planar shape?
 
  1. IF3
  2. PCl3
  3. NH3
  4. BF3


Solution

The correct option is D BF3
IF3 molecule has 3 bond pairs and 2 lone pairs. So, its steric number is 5 and its hybridisation is sp3d. Hence, the geometry of IF3 molecule is trigonal bipyramidal and has a distorted T-shape.
PCl3 molecule has 3 bond pairs and 1 lone pair. So, its steric number is 4 and its hybridisation is sp3. Hence, the geometry of PCl3 molecule is tetrahedral and the shape is pyramidal.

NH3 molecule has 3 bond pairs and 1 lone pair. So, its steric number is 4 and its hybridisation is sp3. Hence, the geometry of NH3 molecule is tetrahedral and the shape is pyramidal.

BF3 molecule has 3 bond pairs and no lone pairs. So, its steric number is 3 and its hybridisation is sp2. Hence, the geometry and the shape of BF3 molecule is trigonal planar.

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