Chemistry - GOC Question with Solution | TestHub
ChemistryGOCAromaticityMedium2 minQB
ChemistryMediumsingle choice
Why is compound A (phenanthrene) more stable than compound B (anthracene) ?
(A) 
(B) 
Options:
Answer:
A
Solution:
In the most stable Kekulé structure of phenanthrene the two outer rings are both benzene sextets, so it keeps two intact benzene units (resonance energy about 92 kcal/mol). In anthracene only one outer ring can be a full sextet at a time, so its resonance energy (about 84 kcal/mol) is smaller, and phenanthrene is more stable.
Stream:JEESubject:ChemistryTopic:GOCSubtopic:Aromaticity
⏱ 2mℹ️ Source: QB
Doubts & Discussion
Loading discussions...
