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

  • question_answer On analysis, a saturated hydrocarbon is found to contain 83.70 percent carbon and 16.30% hydrogen. The empirical formula will be (at. wt. of C=12, at. wt. of H = 1) [MP PMT 1995]

    A) \[{{C}_{3}}{{H}_{6}}\]

    B) \[{{C}_{3}}{{H}_{8}}\]

    C) \[{{C}_{3}}{{H}_{7}}\]

    D) \[{{C}_{6}}{{H}_{12}}\]

    Correct Answer: C

    Solution :

       Element             No. of moles         Simple ratio
    C = 83.7% H = 16.3% 83.7/12 = 6.9 6.9/6.9 = 1 × 3 = 3
    16.3/1 = 16.3 16.3/0.9 = 2.3 × 3 = 7
    Empirical formula = \[{{C}_{3}}{{H}_{7}}\].


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