Question:
Which of the following reactions takes place when tertiary butanol is passed over heated copper at 573 K?
Which of the following reactions takes place when tertiary butanol is passed over heated copper at 573 K?
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Tertiary alcohols undergo dehydration over heated copper at ~573 K to form alkenes.
Updated On: Jun 26, 2026
- Dehydrogenation reaction
- Dehydration reaction
- Oxidation reaction
- Addition reaction
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The Correct Option is B
Solution and Explanation
Step 1: Identify reaction conditions.
Tertiary alcohol heated over copper at 573 K favors elimination of water.
Step 2: Reaction type.
Dehydration of tertiary alcohols occurs to form alkenes (E1 mechanism).
Step 3: Dehydrogenation comparison.
Dehydrogenation occurs at higher temperatures or with metal catalysts, producing ketones/aldehydes.
Step 4: Oxidation and addition reactions.
Oxidation is not favored for tertiary alcohols under these conditions. Addition reaction is unrelated.
Step 5: Conclusion.
The reaction taking place is dehydration: \[ \text{(CH}_3)_3\text{C–OH} \xrightarrow{\text{Cu, 573 K}} (\text{CH}_3)_2\text{C=CH}_2 + H_2O \]
Tertiary alcohol heated over copper at 573 K favors elimination of water.
Step 2: Reaction type.
Dehydration of tertiary alcohols occurs to form alkenes (E1 mechanism).
Step 3: Dehydrogenation comparison.
Dehydrogenation occurs at higher temperatures or with metal catalysts, producing ketones/aldehydes.
Step 4: Oxidation and addition reactions.
Oxidation is not favored for tertiary alcohols under these conditions. Addition reaction is unrelated.
Step 5: Conclusion.
The reaction taking place is dehydration: \[ \text{(CH}_3)_3\text{C–OH} \xrightarrow{\text{Cu, 573 K}} (\text{CH}_3)_2\text{C=CH}_2 + H_2O \]
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