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Hückel rule is a simple criterion used in organic chemistry to predict the aromatic character of planar, cyclic, and fully conjugated molecules. According to Hückel rule, a compound will be aromatic if it contains a total of (4n + 2) π electrons, where n is a non-negative integer such as 0, 1, 2, 3, and so on. The rule is based on molecular orbital theory and explains why certain cyclic conjugated systems _________ _____ __________ ______ ___ ______ ____ _________ ____ ___ _____.
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