Nucleophilic aromatic substitution only occurs by an addition-elimination mechanism with aryl halides that contain groups. meta electron-withdrawing ortho or para electron-donating ortho or para electron-withdrawing only ortho electron-withdrawing

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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.