How many moles of a diol are required to produce one moleof hydrogen gas?
Correct answer: A. 1
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
A diol is an alcohol with two hydroxyl (-OH) groups. When reacted with an excess of an active metal like sodium, both acidic protons will be displaced to form H₂ gas. The stoichiometry is R(OH)₂ + 2Na → R(ONa)₂ + H₂, meaning one mole of the diol produces one mole of H₂ gas.
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About Alcohols and Phenols
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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