Question

Structural isomers of octane,nonane,decane.with names

Answer 1

Octane has 18 structural isomers (24 including stereoisomers):

• 1)Octane (n-octane)
• 2-Methylheptane
• 3-Methylheptane (2 enantiomers)
• 4-Methylheptane
• 3-Ethylhexane
• 2,2-Dimethylhexane
• 2,3-Dimethylhexane (2 enantiomers)
• 2,4-Dimethylhexane (2 enantiomers)
• 2,5-Dimethylhexane
• 3,3-Dimethylhexane
• 3,4-Dimethylhexane (2 enantiomers + 1 meso compound)
• 3-Ethyl-2-methylpentane
• 3-Ethyl-3-methylpentane
• 2,2,3-Trimethylpentane (2 enantiomers)
• 2,2,4-Trimethylpentane (isooctane)
• 2,3,3-Trimethylpentane
• 2,3,4-Trimethylpentane
• 2,2,3,3-Tetramethylbutane

2)Nonane
2-methyloctane
3-methyloctane
4-methyloctane
2,2-dimethylheptane
2,3-dimethylheptane
2,4-dimethylheptane
2,5-dimethylheptane
2,6-dimethylheptane
3,3-dimethylheptane
3,4-dimethylheptane
3,5-dimethylheptane
4,4-dimethylheptane
3-ethylheptane
4-ethylheptane
2,2,3-trimethylhexane
2,2,4-trimethylhexane
2,2,5-trimethylhexane
2,3,3-trimethylhexane
2,3,4-trimethylhexane
2,3,5-trimethylhexane
2,4,4-trimethylhexane
3,3,4-trimethylhexane
2-methyl-3-ethylhexane
2-methyl-4-ethylhexane
3-methyl-3-ethylhexane
3-methyl-4-ethylhexane
2,2,3,3-tetramethylpentane
2,2,3,4-tetramethylpentane
2,2,4,4-tetramethylpentane
2,3,3,4-tetramethylpentane
2,2-dimethyl-3-ethylpentane
2,3-dimethyl-3-ethylpentane
2,4-dimethyl-3-ethylpentane
3,3-diethylpentane



3)Straight-chain

• 3)Decane

Nonane

• 2-Methylnonane
• 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[3] 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