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They are both approximations that look at the problem from different angles. MO looks at the molecule as a whole, VB looks at it as a collection of bonds. In their theoretical limits, both are the same. As with all things in chemistry (and life) it is good to look at problems from different perspectives. AND combining them is more powerful than either one ...


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There is no point in thinking about hybridisation in the sense of a process, where orbitals "change" their form. You have the basic (atomic) orbitals, and (atoms in) compounds additionally have "hybrid" orbitals. They are called "hybrid" because you can mathematically model them relatively accurately by combining atomic orbitals....


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According to VSEPR theory, the bond angles in case of CH3Cl and CH3Br is based on bond pair - bond pair repulsion only as there are no lone pairs in them. The bond pair electrons are spread within the bond distance between the bonded atoms. The bond distance for C-Br bond (1.934 A°) is larger than the C-Cl bond (1.781 A°) and also there is not effective ...


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