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How many isomers does pentane have?

Chemistry
JAMB 2003

How many isomers does pentane have?

  • A. 6
  • B. 5
  • C. 4
  • D. 3
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Correct Answer: Option D
Explanation

Isomers are chemical compounds with the same Molecular formula but different structural formula or arrangements of atoms in the molecule.

Pentane, an organic compound with the chemical formula C\(_5\)H\(_{12}\), has three structural isomers: 

  • n-pentane: A straight chain of five carbon atoms
  • 2-methylbutane: A four-carbon chain with a methyl group branching off the second carbon atom
  • 2,2-dimethylpropane: A three-carbon chain with two methyl groups branching off the middle carbon atom

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