Question

resonance structure for thiopene

Answer 1

Hey:-) Mate here is your ans
--Thiophene Resonance Structures--
Here are the resonance structures we can draw for tropolone, the positive charge can be delocalized to every carbon in the ring. ... and for thiophene, they are the same as furan, just replace the oxygen with a sulfur atom in the resonance structures.
Hope it's helpful for you.

1st image-The resonating structures for furan are:
2nd-The resonating structures for thiophene are:
3rd-The resonating structures for pyrrole are:

Answer 2

Answer:

The resonance structure of thiophene is given as:

Let's discuss about conditions needed to be aromatic and thiophene to have a better understanding about resonating structures of thiophene.

Explanation:

What are the characterstics necessary for a heterocyclic compound to be aromatic?

• An aromatic compound must have a cyclic cloud of pi-electrons and must be planar.
• It is made up of sp² hybridised carbon atoms and must follow the Huckel rule.
• This rule states that the ring system must have (4n + 2) electrons, where 'n' can be any whole integer  (0, 1, 2, 3, etc).

What is thiophene?

• Thiophene, often known as C₄H₄S, is a heterocyclic molecule.
• It is aromatic as evidenced by its numerous substitution reactions and consists of a five-membered  planar ring.
• It's a white liquid with a benzene-like odour.
• It mimics benzene in the majority of its reactions.

The structure of Thiophene is given as:

What are resonating structures of thiophene?

• Thiophene is a resonance hybrid, with the S-atom contributing two electrons to the formation of a (4n + 2) electron.
• Thiophene has a resonance energy of 117 KJ/mol.
• Sulphur has a lower electronegative potential than oxygen or nitrogen and may also employ 3d orbitals (O and N cannot).
• As a result, thiophene has more canonical  forms than furan and pyrrole.

The resonating structures of thiophene is given in the picture.