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JEE Main levelSingle correct optionDifficulty 2 of 3hx267

How many monochlorination products (constitutional isomers; ignore stereoisomers) can the alkane shown give on free-radical chlorination?

  1. A3
  2. B4
  3. C5
  4. D6

Answer: B

2-Methylbutane has four kinds of equivalent hydrogen: the six hydrogens of the two equivalent methyls on C-2, the single tertiary hydrogen, the CH2 hydrogens, and the terminal CH3 hydrogens. Each gives a different monochloride: 1-chloro-2-methylbutane, 2-chloro-2-methylbutane, 2-chloro-3-methylbutane and 1-chloro-3-methylbutane (RDKit count: 4).
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