Find the number of compounds which are aromatic :
(i) (ii) (iii) (iv)
(v) (vi) (vii) (viii)
(ix) (x) (xi)

Question

Find the number of compounds which are aromatic : (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix) (x) (xi)

TestHub · Accepted Answer

Aromatic needs a planar, cyclic, fully conjugated ring with (4n + 2) π electrons.

(i) Tropylium ion, 6π: aromatic. (ii) Cyclopentadienyl anion, 6π: aromatic. (iii) Azulene, 10π: aromatic. (iv) Cyclobutadiene, 4π: anti-aromatic. (v) Cyclopropenyl cation, 2π: aromatic. (vi) Cycloheptatriene has an $s p^{3}$ carbon: not. (vii) Furan, 6π: aromatic. (viii) 2H-Pyran has an $s p^{3}$ carbon: not. (ix) Cyclooctatetraene is tub-shaped: not. (x) Pyrylium cation, 6π: aromatic. (xi) Naphthalene, 10π: aromatic.

Aromatic: (i), (ii), (iii), (v), (vii), (x), (xi) = 7.

Answer: 7.

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