What is the product of the reaction of 1-pentyne with H2 in the presence of Lind

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Question: What is the product of the reaction of 1-pentyne with H2 in the presence of Lindlar\'s catalyst?

Options:

Correct Answer: 2-pentene

Solution:

Lindlar\'s catalyst selectively hydrogenates alkynes to alkenes, resulting in the formation of cis-2-pentene from 1-pentyne.

What is the product of the reaction of 1-pentyne with H2 in the presence of Lindlar's catalyst?

What is the product of the reaction of 1-pentyne with H2 in the presence of Lindlar's catalyst?

Step 1: Identify the starting material, which is 1-pentyne. This is an alkyne with a triple bond between the first and second carbon atoms.
Step 2: Understand that we are using H2 (hydrogen gas) in the reaction. This means we will be adding hydrogen to the molecule.
Step 3: Recognize that Lindlar's catalyst is a special type of catalyst that helps in the hydrogenation process. It is used to convert alkynes to alkenes without fully saturating them to alkanes.
Step 4: When 1-pentyne reacts with H2 in the presence of Lindlar's catalyst, the triple bond (C≡C) is converted to a double bond (C=C).
Step 5: The result of this reaction is the formation of cis-2-pentene, which has the double bond between the second and third carbon atoms and the two substituents on the same side (cis configuration).

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