Chemistry - GOC Question with Solution | TestHub

Using the supplied data, four isolated cyclooctene-like double bonds would release 4 × 23 = 92 kcal ${\mathrm{mol}}^{-1}$. Cyclooctatetraene releases 98, which is 6 kcal ${\mathrm{mol}}^{-1}$ more. Its nonplanar tub conformation prevents continuous planar eight-pi-electron overlap, so it is nonaromatic rather than aromatic. It is destabilized by 6 kcal ${\mathrm{mol}}^{-1}$ relative to the stated hypothetical reference. Hence $\mathrm{D}$; the word highly has been removed because the calculation does not justify it.