The number of structural isomers of pentane is

  1. A. 5
  2. B. 4
  3. C. 2
  4. D. 3

Correct Answer: D. 3

Explanation

Pentane (C_5H_{12}) has three structural isomers: n-pentane (straight chain), isopentane (branched chain), and neopentane (highly branched).

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