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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