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Explain how valence bond theory accounts...

Explain how valence bond theory accounts for
(i) a carbon-carbn double bond (C=C)
(ii) a carbon -carbon triple bond (C=C)

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(i) According to the valence bond theory, the two carbon atoms that are involved in the formation of C = C bond are `sp^(2)`-hybridised. The bond is made up a sigma bond (formed by the axial overlap of hybridised orbitals) and a pi bond (formed by the sidewise overlap of unhybridised orbitals).
(ii) The carbon atoms that is involved in the formation of C = C bond are sp-hybridised. The bond is up of sigma bond (formed by the axial overlap of the hybridised orbitals) and two pi bond (formed by the sidewise overlap the unhybridised orbitals).
For further details and pictorial representation, consult section 4.20.
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