6-6-6-6 CH3 I CH₂ CH₂ CH₂-C-CH₂-C- CH₂ CH3 I CH3 I CH3 CH-CH-CH₂-CH₂-CH₂ I I CH3 CH₂ - CH₂ CH₂ - CH₂ - CH₂ I CH₂CH₂-C-CH₂-CH₂-CH₂ I CH3CH₂-CH-CH3 tetramethyl hexane

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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.