How many isomers can be formed from C7H16?

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Discussion Overview

The discussion revolves around the molecular formula C7H16 and the identification of its possible isomers. Participants explore methods for determining isomer counts, the nature of isomers, and the implications of structural variations, including the consideration of optical isomers.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • Some participants assert that there are nine isomers of C7H16, while others claim there are more, leading to disagreement on the total count.
  • One participant suggests a method for identifying isomers by visualizing structures and checking for duplicates.
  • Another participant mentions that C7H16 follows the formula CnH2n+2, indicating it is a saturated acyclic alkane.
  • There is a discussion about the absence of optical isomers due to the lack of chiral centers in the molecule, with some participants clarifying the conditions for chirality.
  • Participants propose drawing structures to identify isomers, including variations with different alkyl groups such as methyl and ethyl.
  • A formula for calculating unsaturation in hydrocarbons is introduced, but its relevance to the discussion of C7H16 is debated.
  • Some participants discuss the naming conventions for isomers, particularly regarding 2-ethylpentane and 3-methylhexane, indicating a potential overlap in structural representation.

Areas of Agreement / Disagreement

There is no consensus on the total number of isomers for C7H16, with participants presenting conflicting views on whether it is nine or more. The discussion remains unresolved regarding the inclusion of optical isomers and the correct naming of certain structures.

Contextual Notes

Participants express uncertainty about the mathematical methods for determining isomers and the implications of structural variations. The discussion includes assumptions about the nature of isomers and the conditions under which they are counted.

  • #31
why can't we name it 3-ethyl, butane?

c – c – c – c – c
|
c
|
c
 
Last edited:
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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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