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Which reagent is used to convert an alkyne to a cis-alkene?

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Question: Which reagent is used to convert an alkyne to a cis-alkene?

Options:

  1. H2/Pd
  2. H2/Lindlar\'s catalyst
  3. Li/NH3
  4. Na/NH3

Correct Answer: H2/Lindlar\'s catalyst

Solution: 

H2 in the presence of Lindlar\'s catalyst is used to convert an alkyne to a cis-alkene.

Which reagent is used to convert an alkyne to a cis-alkene?

Practice Questions

Q1
Which reagent is used to convert an alkyne to a cis-alkene?
  1. H2/Pd
  2. H2/Lindlar's catalyst
  3. Li/NH3
  4. Na/NH3

Questions & Step-by-Step Solutions

Which reagent is used to convert an alkyne to a cis-alkene?
  • Step 1: Start with an alkyne, which is a type of hydrocarbon with a triple bond between two carbon atoms.
  • Step 2: To convert the alkyne to a cis-alkene, you need to add hydrogen (H2) to it.
  • Step 3: Use a special catalyst called Lindlar's catalyst, which helps the reaction happen in a controlled way.
  • Step 4: The reaction will add hydrogen to the triple bond of the alkyne, turning it into a double bond, resulting in a cis-alkene.
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