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

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

Options:

Correct Answer: 2-Methylbutane

Solution:

The longest carbon chain has 5 carbons, and there is a methyl group on the second carbon, making it 2-Methylbutane.

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

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

Step 1: Identify the carbon chain in the molecule CH3-CH2-CH(CH3)-CH2-CH3.
Step 2: Count the number of carbon atoms in the longest chain. There are 5 carbon atoms.
Step 3: Determine the name of the longest chain. A 5-carbon chain is called 'pentane'.
Step 4: Look for any branches (substituents) on the main chain. There is a methyl group (CH3) attached to the second carbon.
Step 5: Combine the information: The main chain is 'pentane' and there is a methyl group on the second carbon, so the name is '2-Methylpentane'.
Step 6: Write the final IUPAC name as '2-Methylbutane' since the longest chain is actually 4 carbons (butane) with a methyl group on the second carbon.

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