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

Discuss the shape of the following molec | Class 11 Chemistry Chapter Chemical Bonding and Molecular Structure, Chemical Bonding and Molecular Structure NCERT Solutions

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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Comments

Jubin Debnat
2019-10-03 19:44:33

Thank you

Melvin Y Sayee
2019-07-14 16:28:21

merci

Chandan Kumar
2019-03-01 21:10:22

Thank you

Rahul
2019-02-26 09:27:24

What is the shape of XeF4

Rahul
2019-02-26 09:25:54

XeF4. & SF6 shape

Raghiv
2019-01-18 21:40:25

Plz explain, CH4 also

Anna
2017-09-05 22:27:08

why CH4,NH3,H2O are not shown?

perveen neha
2017-08-05 14:45:40

PH3 does not have trigonal bipyramidal shape rather it has trigonal pyramidal shape

jjjjjjjjjjiu
2017-01-20 23:24:54

shape ofch4

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Welcome to the NCERT Solutions for Class 11 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 7: Discuss the shape of the following molecules using the VSEPR model: BeCl2, BCl3, SiCl4, AsF5, H2S....

Discuss the shape of the following molec | Class 11 Chemistry Chapter Chemical Bonding and Molecular Structure, Chemical Bonding and Molecular Structure NCERT Solutions

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