(a) Ph-C-H (c) CH₂OH, H¹ CH₂OOCH3 Ph—C—H Ph₂P=CH₂ CH₂ (b) CH3-C-H (d) PhNHNH₂, H+ H+ H₂O N–NHPh CH₂-C-H 0 CH₂ CH₂ I ОН ОН

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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.