Multiple Choice
Which of the following best describes bond dissociation energy?
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11. Bonding & Molecular Structure
Bond Energy
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Which of the following bonds has the longest bond length?
A
C–C single bond
B
C≡C triple bond
C
C=C double bond
D
C–H bond
Verified step by step guidance1
Understand that bond length is the average distance between the nuclei of two bonded atoms. Generally, bond length decreases as bond order increases because more shared electrons pull the atoms closer together.
Recall the bond orders for the given bonds: a C–C single bond has bond order 1, a C=C double bond has bond order 2, and a C≡C triple bond has bond order 3. The C–H bond is a single bond between carbon and hydrogen.
Compare the bond lengths based on bond order: triple bonds are shortest, double bonds are intermediate, and single bonds are longest among carbon-carbon bonds.
Consider that C–H bonds are typically shorter than C–C single bonds because hydrogen is smaller than carbon, leading to a shorter bond length despite being a single bond.
Conclude that among the options, the C–C single bond has the longest bond length because it has the lowest bond order among carbon-carbon bonds and involves two larger atoms compared to the C–H bond.
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