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The unequal sharing of bonded pair of el...

The unequal sharing of bonded pair of electrons between two atoms in a molecule causes ___________.

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Geometry of organic compound is often described in terms of the valence shell electron pair repulsion theory. The VSEPR model rests on the premise that an electron pair, either bonded pair or an unshared pair, associated with a particular atom will be as far away from the atom's other electron pairs as possible. The tricoordinate carbon atoms of an alkene or carbonyl group also form bonds with angles near 120^(@) . In these compounds, unsaturated double bonds have two electron pairs-those of the sigma and pi bonds. Repulsion by these two pairs are some what greater than those between single bonds, so that deviation from exact 120^(@) trigonal geometry is observed. Another factor which has important influence on shapes is non bonded repulsion between the atoms within the molecule. Such repulsion is also referred to as steric effects. Select the correct sequence of bond angles indicated in the above molecules.