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Biomolecules question

2024 · 29 Jan · Shift 1 · Q29
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Biomolecules question

2024 · 29 Jan · Shift 1 · Q29

JEE MainChemistryBiomoleculesNumerical+4 / −1
Number of compounds among the following which contain sulphur as heteroatom is ‾\underline{\hspace{2cm}}​. Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine
Numerical answer
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Correct answer: 2

  1. We need to count the compounds that contain sulphur as a heteroatom.

  2. Recall the given compounds:

    • Furan
    • Thiophene
    • Pyridine
    • Pyrrole
    • Cysteine
    • Tyrosine

  3. Check each one:

    (i) Furan

    • Five-membered heterocyclic compound.
    • Heteroatom present is oxygen.
    • So, it does not contain sulphur.

    (ii) Thiophene

    • Five-membered heterocyclic compound.
    • Heteroatom present is sulphur.
    • So, it does contain sulphur.

    (iii) Pyridine

    • Six-membered heterocyclic compound.
    • Heteroatom present is nitrogen.
    • So, it does not contain sulphur.

    (iv) Pyrrole

    • Five-membered heterocyclic compound.
    • Heteroatom present is nitrogen.
    • So, it does not contain sulphur.

    (v) Cysteine

    • Amino acid with side chain −CH2SH-CH_2SH−CH2​SH.
    • It contains sulphur in the thiol group.
    • So, it does contain sulphur.

    (vi) Tyrosine

    • Amino acid with phenolic side chain.
    • It contains oxygen, nitrogen, but no sulphur.
    • So, it does not contain sulphur.

  4. Therefore, the compounds containing sulphur are:

    • Thiophene
    • Cysteine

  5. Total number of such compounds: 222

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