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Get Answers to all your Questions
- #Chemical Bonding and Molecular Structure
- #Chemistry
- #NCERT
- #CBSE 11 Class
- #Chemistry Part I Textbook for Class XI
4.21 Apart from tetrahedral geometry, another possible geometry for is square planar with the four
atoms at the corners of the square and the
atom at its centre. Explain why
is not square planar ?
Answers (1)
The electronic configuration of carbon atom is .
Where it has s-orbital, p-orbital only and there is no d-orbital present.
Hence the carbon atom undergoes hybridization in methane molecule and takes a tetrahedral shape.
And for a molecule to have a square planar structure it must have d orbital present.
But here the absence of d-orbital, as a result, it does not undergo hybridization, the structure of methane cannot be square planar.
Also the reason that bond angle in square planar which makes the molecule more unstable because of repulsion between the bond pairs.
Hence according to VSEPR theory molecule take a tetrahedral structure.
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