Chemistry - GOC Question with Solution | TestHub
ChemistryGOCBond Length, Strength, Cleavage, Rotational Energy BarrierEasy2 minQB
ChemistryEasysingle choice
Phenanthrene has five Kekulé resonance structures. Which of its carbon-carbon bonds is the shortest ?
Options:
Answer:
A
Solution:
Draw the five Kekulé structures. The C₉-C₁₀ bond is a double bond in 4 of the 5 structures, the C₁-C₂ bond in 3 of 5, the C₄-C4a bond in 2 of 5 and the C4a-C4b bond in only 1 of 5.
The bond with the highest double-bond character is the shortest, so C₉-C₁₀ is the shortest.
Stream:JEESubject:ChemistryTopic:GOCSubtopic:Bond Length, Strength, Cleavage, Rotational Energy Barrier
⏱ 2mℹ️ Source: QB
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