Which compound is classified as a six-membered aromatic heterocycle containing a tertiary ring nitrogen whose lone pair resides in an sp2 hybrid orbital outside the aromatic pi system?
Answer and explanation
Correct answer: C. Pyridine
Pyridine is a six-membered aromatic ring where each of the five carbons and the nitrogen atom contributes one 2p electron to form the 6 pi aromatic sextet. The nitrogen's lone pair occupies an sp2 hybrid orbital in the ring plane and is basic. In pyrrole, the lone pair is part of the aromatic pi system.
Practise more Hydrocarbons and Functional Groups.
Free questions with an explanation for every one, and full timed Medical University Entrance Examination (Bulgaria) mock tests.
More Hydrocarbons and Functional Groups questions
- What is the IUPAC name of the branched alkane with structural formula (CH3)2CH-CH2-CH(CH3)2?
- What type of isomerism is demonstrated by butane and 2-methylpropane (isobutane)?
- What is the most stable conformation of cyclohexane at room temperature due to minimized torsional and steric strain?
- Which step in the free-radical chlorination of methane generates chlorine radicals by homolytic cleavage of Cl2?
- According to Markovnikov's rule, what major product is formed when propene reacts with hydrogen bromide (HBr)?
- Why does addition of hydrogen bromide to propene in the presence of benzoyl peroxide yield 1-bromopropane as the major product?