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Questions and Answers
What is the role of the lone pair of electrons on the nitrogen atom in pyridine?
What is the role of the lone pair of electrons on the nitrogen atom in pyridine?
- It is involved in the aromatic π-electron sextet of the ring.
- It contributes to the stabilization of the pyridine ring.
- It is responsible for the acidic property of pyridine.
- It is directed away from the ring and is not involved in the aromatic π-electron system. (correct)
What is the structure of pyridine?
What is the structure of pyridine?
- The ring nitrogen is sp2 hybridized with a lone pair in a p-orbital within the ring plane. (correct)
- The ring nitrogen is sp2 hybridized with a lone pair in a p-orbital perpendicular to the ring plane.
- The ring nitrogen is sp3 hybridized with a lone pair in a p-orbital within the ring plane.
- The ring nitrogen is sp3 hybridized with a lone pair in a p-orbital perpendicular to the ring plane.
Where does pyridine occur in nature?
Where does pyridine occur in nature?
- In coal-tar (correct)
- In natural gas
- In crude oil
- In petroleum jelly
What can be derived theoretically from benzene by replacing a methine group with a nitrogen atom?
What can be derived theoretically from benzene by replacing a methine group with a nitrogen atom?
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Which type of hybridization does the ring nitrogen have in pyridine?
Which type of hybridization does the ring nitrogen have in pyridine?
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Study Notes
Pyridine Structure and Properties
- The lone pair of electrons on the nitrogen atom in pyridine is involved in the π-bonding system, contributing to the aromaticity of the ring.
- Pyridine has a planar, hexagonal ring structure, similar to benzene, with a nitrogen atom replacing one of the carbon atoms.
Occurrence and Derivatives
- Pyridine occurs naturally in certain plants and is also found in tobacco smoke and coffee.
- Pyridine can be derived theoretically from benzene by replacing a methine group (CH) with a nitrogen atom.
Nitrogen Hybridization
- The ring nitrogen in pyridine exhibits sp2 hybridization.
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