A double bond consists of __________________?
Correct answer: C. One sigma and one Pi bonds
- A. Two sigma bonds
- B. Two Pi bonds
- C. One sigma and one Pi bonds
- D. One sigma and two Pi bonds
Explanation
A double bond consists of one sigma bond formed by head-on orbital overlap and one pi bond formed by sideways overlap of p orbitals. The sigma bond holds the two atoms along the internuclear axis, while the pi bond lies above and below that axis. The likely mistake is two sigma bonds, which ignores the different type of overlap in a double bond.
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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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