Organic Chemistry- Geometric and Structural Isomers of C6H12

In summary, the conversation was about drawing and naming the structural isomers of hydrocarbons with the formula C6H12 (cyclohexane). The relevant information was that it was a grade 11 Chemistry assignment and the person only needed the basics. The attempted solution provided a list of isomers, but one of them was incorrect. Additional isomers were suggested to be possible with pentene. The conversation ended with a suggestion to try drawing the isomers with a pencil and paper.
  • #1
MarquisDM
1
0

Homework Statement



Draw and name all of the structural isomers of hydrocarbons with the formula C6H12 (cyclohexane).

2. Relevant information

This is "only" a grade 11 Chemistry Assignment, therefore I only really need the basics when it comes to isomers- not some of the more complex stuff which you may find in a university course. I would appreciate if you could list the isomers for me, or just give me a number of how many there are.

The Attempt at a Solution



The following are all isomers of Cyclohexane:

[cyclohexane]
[methylcyclopentane]
[ethylcyclobutane]
[1,(1/2/3) dimethylcyclobutane]
[propylcyclo propane]
[1-ethyl-(1/2)methylcyclobutane]
[trimethylcyclopropane]
[hexa-(1/2/3)-ene]
[(2/3/4)-methylpenta-1-ene]
[2,3 dimethylbuta-2-ene]
 
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  • #2
MaruisDM said:
The following are all isomers of Cyclohexane:

[cyclohexane]
[methylcyclopentane]
[ethylcyclobutane]
[1,(1/2/3) dimethylcyclobutane]
[propylcyclo propane]
[1-ethyl-(1/2)methylcyclobutane]
[trimethylcyclopropane]
[hexa-(1/2/3)-ene]
[(2/3/4)-methylpenta-1-ene]
[2,3 dimethylbuta-2-ene]

Of all the above stated isomers,
1-ethyl-(1/2)methylcyclobutane is not an isomer of [tex]C_6H_{12}[/tex], as it contains 7 carbon atoms.

Few more isomers would be possible with, pentene.. like (2/3/4)methyl penta-2-ene.
 
  • #3
MarquisDM said:

The Attempt at a Solution



The following are all isomers of Cyclohexane:

[cyclohexane]
[methylcyclopentane]
[ethylcyclobutane]
[1,(1/2/3) dimethylcyclobutane]
[propylcyclo propane]
[1-ethyl-(1/2)methylcyclobutane]
[trimethylcyclopropane]
[hexa-(1/2/3)-ene]
[(2/3/4)-methylpenta-1-ene]
[2,3 dimethylbuta-2-ene]

Your attempt at solution is not an attempt at all, you have just copied and pasted these listed at http://wiki.answers.com/Q/What_is_C6H12.

Try to draw them with a pencil and piece of paper.
 
  • #4
psykatic said:
Of all the above stated isomers,
1-ethyl-(1/2)methylcyclobutane is not an isomer of [tex]C_6H_{12}[/tex], as it contains 7 carbon atoms.

Good catch, they probably meant substituted cyclopropane.
 
  • #5
Thank You, now back to MarquisDM..
 

1. What is the difference between geometric and structural isomers?

Geometric isomers are compounds with the same molecular formula and bonding patterns, but differ in the arrangement of their atoms in 3D space. On the other hand, structural isomers have the same molecular formula but differ in the connectivity of their atoms.

2. How many geometric isomers can C6H12 have?

C6H12 can have a maximum of three geometric isomers, as it contains a double bond which can result in cis-trans isomerism. However, not all compounds with a double bond will exhibit this type of isomerism.

3. Can structural isomers have different physical and chemical properties?

Yes, structural isomers have different arrangements of their atoms, resulting in different physical and chemical properties. For example, two isomers of C6H12, n-hexane and 2-methylpentane, have different boiling points and densities.

4. How can you determine if two compounds are structural isomers?

To determine if two compounds are structural isomers, you can compare their molecular formula and connectivity of their atoms. If they have the same molecular formula but different arrangements of atoms, they are structural isomers.

5. Are geometric isomers optically active?

No, geometric isomers are not optically active as they have the same molecular formula and bonding patterns. Optical activity requires the presence of chiral centers, which geometric isomers do not have.

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