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Which of the following statements about dichloro derivatives (structural isomers, no stereoisomers) is/are correct?

  1. APropane gives 5 dichloro isomers
  2. Bn-Butane gives 6 dichloro isomers
  3. C2-Methylpropane gives 3 dichloro isomers
  4. D2,2-Dimethylpropane gives 3 dichloro isomers

Answer: B, C

Substituting each H pair by Cl and de-duplicating: propane 4, n-butane 6, 2-methylpropane 3, 2,2-dimethylpropane 2 (1,1- and 1,3-). Correct: B, C.
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