Podcast
Questions and Answers
Which type of substitution reactions do furan, thiophene, and pyrrole undergo?
Which type of substitution reactions do furan, thiophene, and pyrrole undergo?
- They do not undergo any substitution reactions
- Only undergo electrophilic substitution at the 𝛽- position
- Only undergo nucleophilic substitution reactions
- Undergo both electrophilic and nucleophilic substitution reactions (correct)
Which of the following is a basic property of pyrrole?
Which of the following is a basic property of pyrrole?
- Has strong acidic properties
- Forms a trimer in concentrated solutions (correct)
- Undergoes electrophilic substitution at the 𝛽- position
- Undergoes nucleophilic substitution reactions easily
Which statement about the aromatic character of these five-membered heterocycles is correct?
Which statement about the aromatic character of these five-membered heterocycles is correct?
- They do not exhibit any aromatic character
- Their aromatic character is due to the presence of 3 p-electrons
- Their aromatic character is due to the presence of 5 p-electrons
- Their aromatic character is similar to that of benzene (correct)
Which atom in furan and thiophene is sp2 hybridized?
Which atom in furan and thiophene is sp2 hybridized?
What is the color of the polymeric product known as pyrrole red?
What is the color of the polymeric product known as pyrrole red?
Polymeric product known as pyrrole red is formed in __________ solutions
Polymeric product known as pyrrole red is formed in __________ solutions
Pyrrole has a weak __________ property
Pyrrole has a weak __________ property
Furan, thiophene and pyrrole undergo electrophilic substitution at the 𝛼- (2- ) __________
Furan, thiophene and pyrrole undergo electrophilic substitution at the 𝛼- (2- ) __________
The oxygen atom in furan and the sulphur atom in thiophene are __________ hybridized
The oxygen atom in furan and the sulphur atom in thiophene are __________ hybridized
Pyrrole in dilute acids forms a trimer and in concentrated solutions it polymerizes to a dark colored polymeric product known as __________
Pyrrole in dilute acids forms a trimer and in concentrated solutions it polymerizes to a dark colored polymeric product known as __________
Flashcards
Furan, thiophene, and pyrrole reactions
Furan, thiophene, and pyrrole reactions
Furan, thiophene, and pyrrole undergo both electrophilic and nucleophilic substitution reactions.
Pyrrole's basic property
Pyrrole's basic property
Pyrrole forms a trimer in concentrated solutions.
Aromatic character of five-membered heterocycles
Aromatic character of five-membered heterocycles
Furan, thiophene, and pyrrole have similar aromatic character to benzene.
Hybridization in furan and thiophene
Hybridization in furan and thiophene
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Pyrrole red color
Pyrrole red color
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Pyrrole red formation conditions
Pyrrole red formation conditions
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Pyrrole's acidic property
Pyrrole's acidic property
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Electrophilic substitution position
Electrophilic substitution position
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Oxygen and sulfur hybridization in furan and thiophene
Oxygen and sulfur hybridization in furan and thiophene
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Pyrrole polymerization product
Pyrrole polymerization product
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Study Notes
Heterocycles: Furan, Thiophene, and Pyrrole
- Furan, thiophene, and pyrrole undergo electrophilic substitution reactions.
- Pyrrole has a basic property, which is being weakly basic.
Aromatic Character
- The correct statement about the aromatic character of these five-membered heterocycles is that they exhibit aromatic character.
Hybridization
- In furan and thiophene, the oxygen and sulfur atoms, respectively, are sp2 hybridized.
Pyrrole Red
- Pyrrole red is a dark-colored polymeric product formed in acidic solutions.
- Pyrrole has a weak acidic property.
Substitution Reactions
- Furan, thiophene, and pyrrole undergo electrophilic substitution at the 𝛼- (2-) position.
Acidic Reactions
- Pyrrole in dilute acids forms a trimer and in concentrated solutions, it polymerizes to form pyrrole red.
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