What is the IUPAC name of the compound with the structure CH3CH2CH(CH3)CH3?
Answer and explanation
Correct answer: A. 2-methylbutane
- Step 1: Find the longest continuous chain: CH3-CH2-CH-CH3 is four carbons (butane), and the fifth carbon is a branch.
- Step 2: Number from the end that gives the branch the lowest number: carbon 2, so 2-methylbutane.
Answer
2-methylbutane.
Why not the others: 3-methylbutane breaks the lowest-number rule; 2-ethylpropane picks a shorter chain; pentane would need the carbons in a straight chain.
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