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What are all of the isomers of octane?

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Quick Answer

There are 18 isomers of octane which are n-octane, 2-methylheptane, 3-methylheptane, 4-methylheptane, 2.2-dimethylhexane, 2.3-dimethylhexane, 2.4-dimethylhexane, 2.5-dimethylexane, 3.3-dimethylhexane, 3.4-dimethylhexane, 3-ethylhexane, 2.2.3-trimethylpentane, 2.2.4-trimethylpentane, 2.3.3-trimethylpentane, 2.3.4-trimethylpentane, 2-methyl-3-ethylpentane, 3-methyl-3-ethylpentane and tetramethylbutane. The chemical formula for Octane is C8H18.

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Full Answer

Octane is an alkane. It has 18 structural isomers as seen above. The most important isomer of this group is the 2.2.4-trimethylpentane (known as isooctane) because it is used as a reference value in the octane rating scale. Isooctane, the 2.2.4-trimethyplentane isomer, is a part of gasoline and it helps to reduce the engine knocking noise vehicles sometimes have.

Octane's 18 isomers all have melting and boiling points.

  • N-Octane has a melting point of -57 degrees Celsius and a boiling point of 126 C.
  • 2-methylheptane has a melting point of -109 C and a boiling point of 118 C.
  • 3-methylheptane has a melting point of -121 C and a boiling point of 119 C.
  • 4-methylheptane has a melting point of -121 C and a boiling point of 118 C.
  • 3-ethylhexane has a boiling point of 119 C.
  • 2.2-dimethylhexane has a melting point of -121 C and a boiling point of 107 C.
  • 2.3-dimethylhexane has a melting point of -110 C and a boiling point of 116 C.

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