How many isomers can be formed from C7H16?

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The discussion centers around finding all possible isomers for the molecular formula C7H16, which is known to have nine structural isomers. Participants explore methods for identifying these isomers without repetition, suggesting techniques like visualizing structures and numbering carbon atoms. The conversation clarifies that C7H16, as a saturated hydrocarbon, cannot have optical isomers due to the absence of chiral centers, and emphasizes the importance of understanding structural versus stereoisomers. A formula for calculating degrees of unsaturation is introduced, helping to determine potential structures based on the number of carbon, hydrogen, and other atoms. The participants also discuss naming conventions for isomers, highlighting the significance of identifying the longest carbon chain for proper nomenclature. Overall, the thread provides insights into both the theoretical and practical aspects of organic chemistry isomer identification.
  • #31
why can't we name it 3-ethyl, butane?

c – c – c – c – c
|
c
|
c
 
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  • #32
Because it wouldn't make sense. If anything, 1-ethyl-butane sounds better. Unless you are asking about different molecule which has been garbled by ASCII - try to post it as http://www.epa.gov/med/Prods_Pubs/smiles.htm.

It is heptane. Look for the longest straight chain.

The idea is to make name unique, your approach will give many names to the same molecule - like 1-methylhexane, 1-ethylpentane, 1-propylbutane, ore even 1,5-dimethylpentane.
 
  • #33
sorry, but i typed the ethyl was in the third position. i just don't know why it became like that
 
  • #34
Formatting with empty spaces never works correctly.

My other remark (about name uniqueness) still holds.
 

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