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This is the list of the 75 isomers of decane.

Straight-chain

• n-Decane

Nonane

• 2-Methylnonane
• 3-3-Methylnonane
• 4-Methylnonane
• 5-Methylnonane

Octane

Ethyl

• 3-Ethyloctane
• 4-Ethyloctane

Dimethyl

• 2,2-Dimethyloctane
• 2,3-Dimethyloctane
• 2,4-Dimethyloctane
• 2,5-Dimethyloctane
• 2,6-Dimethyloctane
• 2,7-Dimethyloctane
• 3,3-Dimethyloctane
• 3,4-Dimethyloctane
• 3,5-Dimethyloctane
• 3,6-Dimethyloctane
• 4,4-Dimethyloctane
• 4,5-Dimethyloctane

Heptane

Propyl

• 4-n-Propylheptane or 4-Propylheptane
• 4-(1-Methylethyl)heptane or 4-Isopropylheptane

Ethyl+Methyl

• 3-Ethyl-2-methylheptane
• 3-Ethyl-3-methylheptane
• 3-Ethyl-4-methylheptane
• 3-Ethyl-5-methylheptane
• 4-Ethyl-2-methylheptane
• 4-Ethyl-3-methylheptane
• 4-Ethyl-4-methylheptane
• 5-Ethyl-2-methylheptane

Trimethyl

• 2,2,3-Trimethylheptane
• 2,2,4-Trimethylheptane
• 2,2,5-Trimethylheptane
• 2,2,6-Trimethylheptane
• 2,3,3-Trimethylheptane
• 2,3,4-Trimethylheptane
• 2,3,5-Trimethylheptane
• 2,3,6-Trimethylheptane
• 2,4,4-Trimethylheptane
• 2,4,5-Trimethylheptane
• 2,4,6-Trimethylheptane
• 2,5,5-Trimethylheptane
• 3,3,4-Trimethylheptane
• 3,3,5-Trimethylheptane
• 3,4,4-Trimethylheptane
• 3,4,5-Trimethylheptane

Hexane

Methyl+Propyl

• 2-Methyl-3-(1-methylethyl)hexane or 3-isopropyl-2-methylhexane

Diethyl

• 3,3-Diethylhexane
• 3,4-Diethylhexane

Ethyl+Dimethyl

• 3-Ethyl-2,2-dimethylhexane
• 3-Ethyl-2,3-dimethylhexane
• 3-Ethyl-2,4-dimethylhexane
• 3-Ethyl-2,5-dimethylhexane
• 3-Ethyl-3,4-dimethylhexane
• 4-Ethyl-2,2-dimethylhexane
• 4-Ethyl-2,3-dimethylhexane
• 4-Ethyl-2,4-dimethylhexane
• 4-Ethyl-3,3-dimethylhexane

Tetramethyl

• 2,2,3,3-Tetramethylhexane
• 2,2,3,4-Tetramethylhexane
• 2,2,3,5-Tetramethylhexane
• 2,2,4,4-Tetramethylhexane
• 2,2,4,5-Tetramethylhexane
• 2,2,5,5-Tetramethylhexane
• 2,3,3,4-Tetramethylhexane
• 2,3,3,5-Tetramethylhexane
• 2,3,4,4-Tetramethylhexane
• 2,3,4,5-Tetramethylhexane
• 3,3,4,4-Tetramethylhexane

Pentane

Dimethyl+Propyl

• 2,4-Dimethyl-3-(1-methylethyl)pentane or 3-Isopropyl-2,4-dimethylpentane

Diethyl+Methyl

• 3,3-Diethyl-2-methylpentane

Ethyl+Trimethyl

• 3-Ethyl-2,2,3-trimethylpentane
• 3-Ethyl-2,2,4-trimethylpentane
• 3-Ethyl-2,3,4-trimethylpentane

Pentamethyl

• 2,2,3,3,4-Pentamethylpentane
• 2,2,3,4,4-Pentamethylpentane

References

1. "Isomers of Alkanes". Retrieved July 7, 2015. (The page may not be perfectly accurate.)
2. "Formula Browser". National Institute of Standards and Technology. Retrieved July 7, 2015.
3. Rule A-2.4

• Hydrocarbons
• Isomerism
• Lists of isomers of alkanes