The number of structural isomers of pentane is
- A. 5
- B. 4
- C. 2
- 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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