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What is the IUPAC name of ?

  1. A1,1-dimethylpropane
  2. B2-methylbutane
  3. C3-methylbutane
  4. D2-ethylpropane

Answer: B

The longest chain has four carbons (butane), with a methyl branch. Numbering from the end nearer the branch gives the methyl locant 2, not 3. The name is 2-methylbutane. 2-Ethylpropane misses the longest chain.
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