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Which reagent can be used to test for the presence of alkenes?

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Question: Which reagent can be used to test for the presence of alkenes?

Options:

  1. Bromine water
  2. Silver nitrate
  3. Sodium hydroxide
  4. Hydrochloric acid

Correct Answer: Bromine water

Solution: 

Bromine water is used to test for alkenes; it will decolorize in the presence of a double bond.

Which reagent can be used to test for the presence of alkenes?

Practice Questions

Q1
Which reagent can be used to test for the presence of alkenes?
  1. Bromine water
  2. Silver nitrate
  3. Sodium hydroxide
  4. Hydrochloric acid

Questions & Step-by-Step Solutions

Which reagent can be used to test for the presence of alkenes?
Correct Answer: Bromine water
  • Step 1: Understand that alkenes are compounds that have a double bond between carbon atoms.
  • Step 2: Know that bromine water is a solution of bromine in water, which is reddish-brown in color.
  • Step 3: When bromine water is added to a sample containing alkenes, a chemical reaction occurs.
  • Step 4: The double bond in the alkene reacts with bromine, causing the reddish-brown color to disappear.
  • Step 5: If the color of bromine water changes from reddish-brown to colorless, it indicates the presence of alkenes.
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