Explanation

(d)
Compound [image:13_image259.emf]has $8 + 2 = 10\pi$ electrons hence is aromatic.[image:13_image260.emf]has $4\pi e^{-}$, [image:13_image261.emf]has $8\pi e^{-}$, while [image:13_image262.emf]has $8 + 1 = 9\pi e^{-}$, hence all these species are not aromatic