Benzopyrene, naphthalene and pyrene are members of these group of aromatic compounds: * Non-benzenoid aromatic compounds Heterocyclic aromatic compounds Benzenoid aromatic compounds Heteronuclear compounds What type of aromatic compound is pyridine? * Benzenoid aromatic compound Non-benzenoid aromatic compound Homonuclear cyclic compound Heterocyclic aromatic compound What property of aromatic rings prevent the involvement of the conjugated structure to addition reactions? * Radical stabilization Resonance stability Inductive effect Aromatic effect

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Diol

In chemistry there are so many chemical compounds that have a hydroxyl group but a chemical compound having two hydroxyl groups (-OH) is termed as a diol. It also implies the presence of two alcohols whereas polyols contain two or more than two hydroxyl groups (-OH). Glycol or 1,2-diol is an aliphatic diol that has two alcohol groups on adjacent carbon atoms. In industries, the most commonly used diol is ethylene glycol.