Which of the following is the correct IUPAC name for CH3-CH=CH-CH2-CH3?

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Question: Which of the following is the correct IUPAC name for CH3-CH=CH-CH2-CH3?

Options:

Correct Answer: 2-pentene

Solution:

The longest chain with the double bond is 5 carbons long, and the double bond starts at the second carbon, making it 2-pentene.

Which of the following is the correct IUPAC name for CH3-CH=CH-CH2-CH3?

Which of the following is the correct IUPAC name for CH3-CH=CH-CH2-CH3?

Step 1: Identify the structure of the molecule. The given structure is CH3-CH=CH-CH2-CH3.
Step 2: Count the number of carbon atoms in the longest continuous chain. There are 5 carbon atoms.
Step 3: Determine where the double bond is located. The double bond (indicated by '=') is between the second and third carbon atoms.
Step 4: Assign a number to the carbon atoms in the chain starting from the end closest to the double bond. This means the double bond starts at carbon 2.
Step 5: Use the IUPAC naming rules. Since there are 5 carbon atoms in the chain, it is called 'pentene' because it has a double bond.
Step 6: Combine the position of the double bond with the name of the chain. The double bond starts at carbon 2, so the name is '2-pentene'.

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