Only sigma bonds are present in__________________?
Correct answer: D. ethoxy ethane
- A. propene
- B. butanoic acid
- C. butanal
- D. ethoxy ethane
Explanation
Ethoxy ethane, CH3CH2-O-CH2CH3, contains only single bonds, and every single bond is a sigma bond. Propene, butanoic acid and butanal each contain a double bond, which includes a pi bond. The common mistake is butanoic acid, if the student overlooks its carbonyl C=O 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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964 free Chemical Bonding MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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