Ethylene glycol, used as antifreeze, is classified as
Correct answer: B. a dihydric alcohol
- A. a monohydric alcohol
- B. a dihydric alcohol
- C. a trihydric alcohol
- D. a phenol
Explanation
Ethylene glycol contains two hydroxyl groups on adjacent carbons, so it is dihydric, while glycerol with three hydroxyls is trihydric and ethanol with one is monohydric. Extra hydroxyl groups mean more hydrogen bonding, which is why glycol is viscous, high boiling and completely miscible with water. Those same properties make it effective as an antifreeze and coolant.
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About Alcohols
Alcohols contain a hydroxyl group attached to a saturated carbon atom and are classified as primary, secondary or tertiary. Their nomenclature, hydrogen bonding, acidity, oxidation, dehydration, reaction with sodium and conversion to haloalkanes are covered, along with the distinction between alcohols and phenols, where the hydroxyl group is attached directly to an aromatic ring.
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