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JEE Main levelSingle correct optionDifficulty 2 of 3hx009

Which of the following alkanes gives only one monochlorination product (constitutional isomers considered; stereoisomers ignored)?

  1. Abutane
  2. B2,2-dimethylpropane
  3. C2,2-dimethylbutane
  4. D2-methylpropane

Answer: B

2,2-Dimethylpropane has twelve equivalent hydrogens (four groups on one carbon), so one monochloride forms. 2-Methylpropane gives 2 products, butane gives 2 and 2,2-dimethylbutane gives 3.
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