JEE Main & Advanced Chemistry Organic Chemistry: Some Basic Principles & Techniques Question Bank Chemical analysis of organic compounds

  • question_answer A compound has 50% carbon, 50% oxygen and approximate molecular weight is 290. Its molecular formula is [MP PET 1995]

    A) CO

    B) \[{{C}_{4}}{{O}_{3}}\]

    C) \[{{C}_{12}}{{O}_{9}}\]

    D) \[{{C}_{3}}{{O}_{3}}\]

    Correct Answer: C

    Solution :

    Elements        Simple ratio \[C\,\,\,\,\,=\,\,\,\,\,\,\,50\,\,\,\,\,\,\,\,\,\,\,\,50/12\,\,\,\,=\,\,\,\,4\] \[(C{{H}_{2}}O)\] Empirical formula = \[{{C}_{4}}{{O}_{3}}\] Empirical formula mass = 96 \[n\,\,=\,\,\frac{290}{96}=3\] Molecular formula = \[{{({{C}_{4}}{{O}_{3}})}_{3}}={{C}_{12}}{{O}_{9}}\].

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