(D) dihydric alcohol is an alcohol that contains two hydroxyl $(-OH)$ groups. Ethylene glycol,with the formula $HO-CH_2-CH_2-OH$,is a classic example

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(D) dihydric alcohol is an alcohol that contains two hydroxyl $(-OH)$ groups. Ethylene glycol,with the formula $HO-CH_2-CH_2-OH$,is a classic example of a dihydric alcohol. Catechol and resorcinol are dihydric phenols,not alcohols. Glycerol is a trihydric alcohol.