ANSWERS: 3
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See http://en.wikipedia.org/wiki/Coordinate_covalent_bond , at least to start with... Follow the links there.
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due tu mutual sharing of lone pair of elecrtons
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ionic and covalent bond are the ideal bonds...but, in most cases, a mixture of these happen. if you think, bond would only form due to electron transfer...that'd be absurd. every elements try to attain the lowest internal energy...which is the building block of bond formation...and, the process involve electron transfer/share/rotation of dipoles/hydrogen bonding/resonance... so, it's not astonishing that one element or molecule would give the both electrons[since, a bond comprises with two electrons]. and, one thing...you cannot identify which electron was the co-ordinate covalent [LPE] electron after the bond has formed.
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