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Why bond angle vary sometime it will 109.28, 107,105.?

Why bond angle vary sometime it will 109.28, 107,105.?

Grade:10

2 Answers

Ravleen Kaur
askIITians Faculty 1452 Points
4 years ago
This is based on VSEPR theory. Due to l.p and b.p repulsions the bond angle changes in sp3.

Please go through our revision notes.

https://www.askiitians.com/revision-notes/chemistry/chemical-bonding/
Vikas TU
14149 Points
4 years ago
Dear student 
vBond angles mainly depend on the following  factors:
Hybridization: Bond angle depends on the state of hybridization of the central atom
Hybridization: sp3, Bond angle: 109∘, Example: CH4
Hybridization: sp2, Bond angle: 120∘, Example: BCl3
Hybridization: sp, Bond angle: 180∘, Example: BeCl2
Generally s- character increase in the hybrid bond, the bond angle increases.
Lone pair repulsion: Bond angle is affected by the presence of lone pair of electrons at the central atom. A lone pair of electrons at the central atom always tries to repel the shared pair (bonded pair) of electrons. Due to this, the bonds are displaced slightly inside resulting in a decrease of bond angle.
Electronegativity: If the electronegativity of the central atom decreases, bond angle decreases.

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