Question

Which of the following sets have both heterocyclic compounds?
A.Phenol and Furan
B.Furan and Thiophene
C.Thiophene and Phenol
D.Furan and Aniline

Answer 1

Hint: The Heterocyclic compounds are the counterparts of homocyclic compounds, which have only ring atoms from the same element. Heterocyclic compounds are those which have five-membered or six-membered rings and contain heteroatoms of Nitrogen (N), Oxygen (O), or Sulphur (S).

Complete step by step answer:
Heterocyclic compounds are the cyclic compounds containing at least two different elements as ring member atoms. Also, heterocyclic rings may contain more than one heteroatom which may be either similar or different.
The common examples of Heterocyclic compounds with one hetero atom are furan, Thiophene. hetero atom O and S is present in the ring respectively.

Furan is a heterocycle containing oxygen which is employed primarily for the conversion to other substances including pyrrole.
Thiophene is a sulphur containing heterocycle which resembles benzene in its chemical and physical properties. It is a frequent contaminant of the benzene obtained from natural sources and was first discovered during the purification of benzene. It is used for the conversion to other substances. Furan and thiophene, both were discovered in the late 19th century.
A molecule of pyridine contains a ring of six atoms among which five are carbon atoms and one nitrogen atom. Pyrrole, Furan, and Thiophene molecules contain five-membered rings each, composed of four atoms of carbon and one atom of nitrogen, oxygen, or sulphur, respectively.
So, Furan and Thiophene are both heterocyclic compounds.

Therefore, the correct answer is option (B).

Note: Heterocyclic compounds include many of the biochemical materials essential to life. Example is nucleic acids, the chemical substances that carry the genetic information controlling inheritance. It consists of long chains of heterocyclic units held together by other types of materials. Many naturally occurring pigments, vitamins, and antibiotics are also heterocyclic compounds and as are most hallucinogens.