Number of compounds among the following which contain sulphur as heteroatom is ____.
Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine
Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine
Answer: 2
Solution
Check each compound for sulphur in the ring or side chain:
Furan (O), Pyridine (N), Pyrrole (N), Tyrosine (only N, O) do not contain sulphur.
Thiophene (S in the ring) and Cysteine (-SH side chain) do contain sulphur as a heteroatom.
Count = 2.
Key confirmed: 2.
Structure of Thiophene
Furan (O), Pyridine (N), Pyrrole (N), Tyrosine (only N, O) do not contain sulphur.
Thiophene (S in the ring) and Cysteine (-SH side chain) do contain sulphur as a heteroatom.
Count = 2.
Key confirmed: 2.

JEE Main · 2024 · 29 Jan 2024 · Shift 1 · Integer answer