Question:
Which of the following reagents can be used to distinguish between alkenes and alkanes?
Which of the following reagents can be used to distinguish between alkenes and alkanes?
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Baeyer's test is a quick method to differentiate alkenes (unsaturated) from alkanes (saturated).
Updated On: May 20, 2025
- Fehling's solution
- Baeyer's reagent (dilute alkaline KMnO\(_4\))
- Benedict's solution
- Sodium metal
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The Correct Option is B
Solution and Explanation
- Baeyer's test uses dilute alkaline potassium permanganate (KMnO\(_4\)), which is purple in color.
- Alkenes react with Baeyer's reagent causing the purple color to disappear (decolorize) due to oxidation of the double bond.
- Alkanes do not react with Baeyer's reagent, so the purple color remains.
- Fehling's and Benedict's solutions are used for detecting aldehydes, not alkenes or alkanes.
- Sodium metal reacts with water and alcohols but cannot distinguish between alkenes and alkanes.
Answer: \(\boxed{\text{B}}\)
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