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VSEPR and VBT

sneha

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17 Mar 2009 10:18:58 IST

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17 Mar 2009 10:18:58 IST

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VSEPR and VBT

Chemistry , Inorganic Chemistry

VSEPR THEORY

This theory is based upon repulsions. It says that repulsion order is

l.p.-l.p. > l.p.-b.p.>b.p.-b.p.

VBT THEORY

This theory is based upon overlapping of hybrid and pure orbitals.
Hybridization = σ bonds + l.p.
Size of all hybrid orbitals is same & all form σ bonds only except in benzyne.
In sp³d³ the three d orbitals are d_xy, ,d_yz, d_xz
In sp³d², d orbitals are d_z², d_x²_-y²
σ bonds are stronger than π bonds.
Attraction µstabilityµB.E µ 1/repulsion µ1/B.Lµ B.O.
More no. of covalent bonds, more stability
Order of Bond Strength is

sp³-sp³< sp³-sp²< sp²-sp²< sp²-sp< sp-sp

Size of hybrid orbital µ 1/s character µ BondStrength

B.S.=> p-p > p-s > s-s

Shapes of molecules using VBT and VSEPR

H-Bonds

Shown by F, N & O. sometimes Cl

Strength of H bond: H…F > H…O > H…N

Ion- Dipole attractions

Attraction between ion and dipole.

Van Der Waals forces

Forces of attraction and repulsion between constituents of a substance.

Dispersion forces(nonpolar molecules)
Dipole- Dipole forces(polar molecules)
Dipole induced dipole forces(between one polar and other non polar molecule)

General points:

Boiling point µMolecular mass µH bonding µpolarity

Van Der Waals forces µmolecular mass

the symbol µ represents "is proportional to"

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Comments (10)

sneha

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17 Mar 2009 10:22:08 IST

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proportionality sign is not appearing clearly. sorry for that

DAREDEVIL!!

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17 Mar 2009 10:47:17 IST

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good effort

DAREDEVIL!!

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17 Mar 2009 10:47:28 IST

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take a hat

saharsha kumar keshkar

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17 Mar 2009 13:21:05 IST

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good!

Mirka

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17 Mar 2009 15:14:25 IST

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good article !

sagar panda

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17 Mar 2009 15:59:04 IST

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really nice!

devi

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17 Mar 2009 16:33:24 IST

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good one..............

sneha

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17 Mar 2009 16:54:55 IST

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thanks for the comments guys. your appreciation motivates me to write such articles

Karthik

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17 Mar 2009 18:48:54 IST

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good work

Arun George

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17 Mar 2009 23:22:43 IST

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really useful...........u 'll crack jee for sure. may god bless.

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