What is the IUPAC name for the compound CH3-CH=CH-CH2-CH3?

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Question: What is the IUPAC name for the compound CH3-CH=CH-CH2-CH3?

Options:

Correct Answer: 2-Pentene

Solution:

The compound is named 2-pentene because the double bond is located between the second and third carbon atoms.

What is the IUPAC name for the compound CH3-CH=CH-CH2-CH3?

What is the IUPAC name for the compound CH3-CH=CH-CH2-CH3?

Step 1: Identify the longest continuous chain of carbon atoms in the compound. In this case, the longest chain has 5 carbon atoms.
Step 2: Count the number of carbon atoms in the longest chain. There are 5 carbon atoms, so the base name is 'pentane'.
Step 3: Determine if there are any double or triple bonds in the compound. Here, there is a double bond between the second and third carbon atoms.
Step 4: Since there is a double bond, change the suffix from 'ane' to 'ene'. This gives us 'pentene'.
Step 5: Number the carbon chain from the end closest to the double bond. The double bond is between carbon 2 and carbon 3.
Step 6: Indicate the position of the double bond in the name. Since the double bond starts at carbon 2, the name becomes '2-pentene'.

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