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Stereochemistry of Anthracene and Polycyclic Benzenoid

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I need some help with these two questions on stereochemistry, bonding and formation.

1. There are four reasonable resonance structures for anthracene. Draw them.

2. A large number of polycyclic benzenoid aromatic hydrocarbons are known. One of these, benz/a/pyrene, is a powerful carcinogen found in tobacco smoke. From the literature, locate and then draw the structure of this hydrocarbon. Can you suggest other sources where this material might be expected to be present?

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The following helps with a problem involving stereochemistry, bonding and formation. This solution details the resonance structure of anthracene and benz[a]pyrene with a diagram included. It also outlines the likely sources of benz[a]pyrene.

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1. There are four reasonable resonance structures for anthracene. Draw them.

Please see the attached graphic for the resonance structures of anthracene as well as the chemical structure for benz[a]pyrene.

2. A large number of polycyclic benzenoid aromatic hydrocarbons are known. One of ...

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