# Homework Help: Which is an Aromatic Compound

1. Jan 29, 2016

1. The problem statement, all variables and given/known data

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

3. 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?

2. Jan 29, 2016

### Suraj M

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. Jan 29, 2016

Doesn't Huckels rule involve pi electrons only? Does it involve all the electrons taking part in the resonating structures?

4. Jan 29, 2016

### Suraj M

Do you think you've considered ALL the pi electrons?

5. Jan 29, 2016

Oh, but then both option 1 and 3 work out to be aromatic as both have 6 pi electrons.

6. Jan 29, 2016

### Suraj M

Is option 3 even a possible structure? Just look at it
Count the number of electrons on each carbon!

7. Jan 29, 2016