Is Option 2 the Correct Answer for Huckel's Law?

  • Thread starter Priyadarshini
  • Start date
In summary, the conversation discusses Huckel's Law and its application in determining the aromaticity of molecules. The participants consider different options and discuss the involvement of pi electrons in the resonance. Ultimately, they come to the conclusion that both option 1 and 3 can be considered aromatic.
  • #1
Priyadarshini
191
4

Homework Statement

WP_20160129_12_55_19_Pro.jpg

Homework Equations


Huckel's Law: 4n+2=pi electrons

The Attempt at a Solution


I'm not sure what the dash and two dots in the brackets mean, are those lone pair of electrons?
Not including them as pi electrons:
option 1: 4= 4n+2
n=1/2, so no aromatic
option 2: 2= 4n+2
n= 0, so aromatic
option 3: 4=4n+2, n=1/2
so the answer should be option 2?
 
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  • #2
I don't know if you were told which electrons to consider when you take the value of n in huckels rule
Does option 1 have just 4 electrons involved in the resonance?
 
  • #3
Suraj M said:
I don't know if you were told which electrons to consider when you take the value of n in huckels rule
Does option 1 have just 4 electrons involved in the resonance?
Doesn't Huckels rule involve pi electrons only? Does it involve all the electrons taking part in the resonating structures?
 
  • #4
Do you think you've considered ALL the pi electrons?
 
  • #5
Suraj M said:
Do you think you've considered ALL the pi electrons?
Oh, but then both option 1 and 3 work out to be aromatic as both have 6 pi electrons.
 
  • #6
Is option 3 even a possible structure? Just look at it
Count the number of electrons on each carbon!
 
  • #7
Suraj M said:
Is option 3 even a possible structure? Just look at it
Count the number of electrons on each carbon!
Ah, I see! Thanks.
 

1. What is an aromatic compound?

An aromatic compound is a type of organic compound that contains a ring of atoms with alternating single and double bonds. These compounds often have a strong, pleasant smell and are highly stable due to their resonance structure.

2. How are aromatic compounds different from other organic compounds?

Aromatic compounds have a unique chemical structure that makes them different from other organic compounds. They are characterized by their ring structure and the presence of delocalized electrons, which give them unique properties such as stability and reactivity.

3. What are some examples of aromatic compounds?

Some common examples of aromatic compounds include benzene, toluene, and xylene. These compounds are often used in the production of plastics, dyes, and fragrances.

4. How are aromatic compounds used in research and industry?

Aromatic compounds have a wide range of applications in research and industry. They are used as solvents, chemical intermediates, and in the production of various consumer products. They also play a key role in pharmaceuticals, food additives, and pesticides.

5. What are the health and environmental effects of aromatic compounds?

Some aromatic compounds, particularly those containing benzene, have been linked to health issues such as cancer and neurological disorders. These compounds can also have negative effects on the environment, as they are often released into the air and water during manufacturing processes.

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