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What is the IUPAC name of ?

  1. A2-methylpentane
  2. B3-methylpentane
  3. C3-ethylbutane
  4. D2-ethylbutane

Answer: B

The longest chain is five carbons (pentane), because the chain runs through the CH2CH3 groups on both sides of the CH. The methyl group sits on the middle carbon, C3. The name is 3-methylpentane. 2-Ethylbutane uses a shorter chain.
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