Which of the following is NOT an aromatic compound?

ANaphthalene
BCycloocta-1,3,5,7-tetraene
CThiophene
DPyridine

Answer: B

An aromatic compound is cyclic, planar and fully conjugated, with (4n + 2) pi electrons. Pyridine, thiophene and naphthalene each satisfy this (6, 6 and 10 pi electrons). Cycloocta-1,3,5,7-tetraene has 8 pi electrons and is non-planar (tub-shaped), so it is non-aromatic.

Practice IUPAC Nomenclature and Structural Isomerism More on Classification and degree of unsaturation

Previous questionNext question

More questions on Classification and degree of unsaturation

Which of the following molecular formulas corresponds to a degree of unsaturation of 5? JEE Main level
Calculate the degree of unsaturation (number of rings plus pi bonds) of a compound of molecular formula C10H11ClN2O2. Give the answer as an ... JEE Main level
What is the degree of unsaturation of 4-ethenylcyclohexene? JEE Main level
The open-chain hydrocarbons that contain exactly one C=C and one CequivC bond form a homologous series. What is the general formula of this ... JEE Main level
Which of the following statements is/are correct? JEE Main level
For 3-methylpentane, CH3-CH2-CH(CH3)-CH2-CH3, which of the following statements is/are correct? JEE Main level