Question

Why is pyrrole more reactive than furan and thiophene?

Answer 1

Pyrrole is more reactive than furan and thiophene in electrophilic reactions. ... Therefore pyrrole is more prone to electrophilic substitution than furan. The nitrogen atom in pyrrole can conjugate with the π-electrons on the ring, so the density of the π-electrons on the ring will increase.

Answer 2

Properties of Pyrrole, Furan, Thiophene

Pyrrole

• Pyrrole, any of a class of heterocyclic organic compounds with a ring structure consisting of four carbon atoms and one nitrogen atom.

• Pyrrole is a five-membered heterocyclic aromatic organic molecule with the formula $C_{4}H_{4} NH$.

• It's a clear, colorless liquid that darkens quickly when exposed to air.

Furan

• Furan is a five-membered aromatic ring containing four carbon atoms and one oxygen atom that makes up a heterocyclic organic molecule.
• Furans are a type of chemical compound that contains such rings. Furan is a colourless, highly volatile, flammable liquid with a boiling point at room temperature.

Thiophene

• Thiophene has the formula $C_{4} H_{4} S$  and is a heterocyclic molecule.
• It is aromatic, as evidenced by its extensive substitution reactions, and consists of a planar five-membered ring.

Explanation for reactivity:

Pyrole has a substantially lower resonance energy than furan and thiophene. Pyrole's reactivity is increased as a result of this.

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