What is the basis of comparison between two aromatic compounds having different ring structures Like in propyl and heptyl rings
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You have to take ring strain into account. If you analyze the energy of an organic cycle as a function of the number of atoms in the ring, you find out that cyclohexane and cyclopentane rings are most stable, because the internal angles of an hexagon (120°) and a pentagon (108°) are closer to the angle in a tetrahedron (109°28').