A coordinate or dative covalent bond differs from an ordinary covalent bond in that
Correct answer: A. both shared electrons come from the same atom
- A. both shared electrons come from the same atom
- B. no electrons are shared
- C. it is much weaker than a normal covalent bond
- D. it involves the transfer of electrons
Explanation
One atom supplies the whole electron pair while the other provides an empty orbital, as when ammonia donates its lone pair to a hydrogen ion to form the ammonium ion. Once formed, the bond is indistinguishable from any other covalent bond, which is why all four N-H bonds in ammonium are identical. Complex ion formation depends entirely on this type of bonding.
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About Sigma and Pi Bonds
A sigma bond forms by direct end-to-end overlap along the internuclear axis, whereas a pi bond forms by sideways overlap of parallel orbitals. The topic covers single, double and triple bonds, bond composition, restricted rotation and the relation between sigma and pi bonding and orbital hybridisation.
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