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Class 11
Chemistry
Chemical Bonding and Molecular Structure
discuss the shape of the following molecules using...

Question:
Discuss the shape of the following molecules using the VSEPR model:

BeCl₂, BCl₃, SiCl₄, AsF₅, H₂S, PH₃

Answer:

Valence shell electron pair repulsion (VSEPR) theory:

It is a model used to predict the 3D geometry of individual molecules from the number of electron pairs surrounding their central atoms. It was developed by Gillespie & Nyholm. The various geometries are as follows according to number of lone pair present:

BeCl₂:

The central atom has no lone pair and there are two bond pairs. i.e., BeCl₂ is of the type EX₂. Hence, it has a linear shape.

BCl₃:

The central atom has no lone pair and there are three bond pairs. Hence, it is of the type EX₃. Hence, it is trigonal planar.

SiCl4:

The central atom has no lone pair and there are four bond pairs. Hence, the shape of SiCl₄ is tetrahedral being the EX₄ type molecule.

AsF5:

The central atom has no lone pair and there are five bond pairs. Hence, AsF₅ is of the type EX₅. Therefore, the shape is trigonal bipyramidal.

H₂S:

The central atom has one lone pair and there are two bond pairs. Hence, H₂S is of the type AB₂E. The shape is Bent.

PH3:

The central atom has one lone pair and there are three bond pairs. Hence, PH₃ is of the EX5 type. Therefore, the shape is trigonal bipyramidal.

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Question:
Discuss the shape of the following molecules using the VSEPR model:

BeCl₂, BCl₃, SiCl₄, AsF₅, H₂S, PH₃

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Question: Discuss the shape of the following molecules using the VSEPR model: BeCl2, BCl3, SiCl4, AsF5, H2S, PH3

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Question:
Discuss the shape of the following molecules using the VSEPR model:

BeCl₂, BCl₃, SiCl₄, AsF₅, H₂S, PH₃