Sharing of 1 electron pair by one specie forms_________________?
Correct answer: D. Coordinate covalent bond
- A. Single covalent bond
- B. Hydrogen bond
- C. Double covalent bond
- D. Coordinate covalent bond
Explanation
A coordinate covalent bond forms when one species donates both electrons of the shared electron pair, although the pair is then shared by both atoms. This distinguishes it from an ordinary covalent bond, in which each atom usually contributes one electron. The likely mistake is choosing a because one shared pair gives a single bond, but the question specifies that one species supplies the pair.
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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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