Question:
What is the product formed when a primary alcohol undergoes catalytic dehydrogenation by passing its vapor over heated copper at \(573\) K ?
What is the product formed when a primary alcohol undergoes catalytic dehydrogenation by passing its vapor over heated copper at \(573\) K ?
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Primary alcohols give aldehydes on dehydrogenation over copper at 573 K.
Updated On: Nov 12, 2026
- Ketone
- Aldehyde
- Alkene
- Ether
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
When alcohol vapour passes over heated copper at \(573\) K, it loses hydrogen (dehydrogenation).
Step 2: Apply to a primary alcohol
\(\text{RCH}_{2}\text{OH}\xrightarrow{\text{Cu},\,573\,\text{K}}\text{RCHO}+\text{H}_{2}\)
The product is an aldehyde.
Step 3: Compare with other alcohols
Secondary alcohols give ketones, and tertiary alcohols give alkenes by dehydration.
Final Answer:
A primary alcohol gives an aldehyde. \[ \boxed{\text{(B) }\text{Aldehyde}} \]
When alcohol vapour passes over heated copper at \(573\) K, it loses hydrogen (dehydrogenation).
Step 2: Apply to a primary alcohol
\(\text{RCH}_{2}\text{OH}\xrightarrow{\text{Cu},\,573\,\text{K}}\text{RCHO}+\text{H}_{2}\)
The product is an aldehyde.
Step 3: Compare with other alcohols
Secondary alcohols give ketones, and tertiary alcohols give alkenes by dehydration.
Final Answer:
A primary alcohol gives an aldehyde. \[ \boxed{\text{(B) }\text{Aldehyde}} \]
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