Quiz | Heterocycles


Which of the following statements is incorrect?

Pyrrole has more aromatic character than furan

Pyridine is a tertiary amine

Pyridine is isoelectronic with benzene

Heterocyclopropanes are more reactive than heterocyclobutanes


How many electrons of nitrogen contribute to the π-system of pyrrole and pyridine?

Pyrrole: 1, Pyridine: 1

Pyrrole: 1, Pyridine: 2

Pyrrole: 2, Pyridine: 1

Pyrrole: 2, Pyridine: 2


Where does electrophilic substitution usually occur in furan?

At the C2 atom

At the C3 atom

At the O atom

All of the above


What is the correct order of the reactivity of pyrrole, furan and thiophene towards electrophiles?

Pyrrole > furan > thiophene

Pyrrole > thiophene > furan

Furan > pyrrole > thiophene

Thiophene > pyrrole > furan


What is the process of the reaction between 4-bromopyridine and sodium ethoxide?



Electrophilic substitution

Nucleophilic substitution


Which of the following statements is incorrect?

Pyridine is less reactive towards electrophiles than benzene

Pyridine and benzene can undergo nucleophilic substitution

Pyridine is electron poor compared to benzene

Both pyridine and benzene react with an alkyllithium to form a C-C bond