Consider the following compounds/species :i. naphthalene ii. cyclopentadienyl anion iii. cyclobutadiene iv. cyclopropenyl anion v. cyclopropenyl cation vi. cyclooctatetraene vii. anthracene (all drawn as structures)The number of compounds/species whi…

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Consider the following compounds/species : i. naphthalene ii. cyclopentadienyl anion iii. cyclobutadiene iv. cyclopropenyl anion v. cyclopropenyl cation vi. cyclooctatetraene vii. anthracene (all drawn as structures) The number of compounds/species which obey Huckel's rule is ________. 1. 5 2. 4 3. 6 4. 2

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Answer: 2. 4 Key idea: Hückel's rule: a planar, cyclic, fully conjugated species with (4n+2) π electrons is aromatic. i. Naphthalene: 10 π e ^- : obeys. ii. Cyclopentadienyl anion: 6 π e ^- : obeys. iii. Cyclobutadiene: 4 π e ^- : no. iv. Cyclopropenyl anion: 4 π e ^- : no. v. Cyclopropenyl cation: 2 π e ^- : obeys. vi. Cyclooctatetraene: 8 π e ^- and non-planar: no. vii. Anthracene: 14 π e ^- : obeys. Four species obey: option 2.

Consider the following compounds/species :i. naphthalene ii. cyclopentadienyl anion iii. cyclobutadiene iv. cyclopropenyl anion v. cyclopropenyl cation vi. cyclooctatetraene vii. anthracene (all drawn as structures)The number of compounds/species whi…

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