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NEET 2025 · ChemistryPrevious Year Question

How many products (including stereoisomers) are expected from the monochlorination of 2-methylbutane, ?

Answer: (B) 6. \textbf{Answer:} (b) \textbf{Solution:} 2-Methylbutane () has four kinds of replaceable hydrogen, giving the constitutional monochloro products 1-chloro-2-methylbutane, 2-chloro-2-methylbutane, 2-chloro-3-methylbutane and 1-chloro-3-methylbutane.

  1. A.5
  2. B.6✓
  3. C.2
  4. D.3

Correct Answer

(B) 6

Solution & Explanation

\textbf{Answer:} (b) \textbf{Solution:} 2-Methylbutane () has four kinds of replaceable hydrogen, giving the constitutional monochloro products 1-chloro-2-methylbutane, 2-chloro-2-methylbutane, 2-chloro-3-methylbutane and 1-chloro-3-methylbutane. Two of these products (1-chloro-2-methylbutane and 2-chloro-3-methylbutane) contain a chiral carbon and therefore exist as a pair of enantiomers (R and S). Counting each enantiomer separately gives a total of 6 distinct products.

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