Question:medium

Number of compounds among the following which contain sulfur as a heteroatom is ___.
Compounds: Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine

Updated On: Feb 4, 2026
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Correct Answer: 2

Solution and Explanation

A heteroatom, in chemistry, is any atom in a ring structure that is not carbon, frequently dictating a molecule's chemical behavior. This analysis focuses on identifying compounds from the provided list that incorporate sulfur as a heteroatom.

  1. Furan: A five-membered heterocyclic compound featuring oxygen as the heteroatom. Sulfur absent.
  2. Thiophene: A five-membered heterocyclic compound with sulfur as the heteroatom. Sulfur present.
  3. Pyridine: A six-membered heterocyclic compound containing nitrogen as the heteroatom. Sulfur absent.
  4. Pyrrole: A five-membered heterocyclic compound characterized by nitrogen as the heteroatom. Sulfur absent.
  5. Cysteine: An amino acid incorporating a thiol group (-SH). Sulfur present.
  6. Tyrosine: An amino acid with a phenolic group. Sulfur absent.

Based on this evaluation, Thiophene and Cysteine are identified as containing sulfur as a heteroatom. Therefore, the count of compounds with sulfur as a heteroatom is 2.

The established range is 2,2, aligning with the computed result of 2.

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