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

  • question_answer An organic compound gave the following results \[C=53.3%,\text{ }H=15.6,\text{ }N=31.1%,\] mol. wt. = 45, What is molecular formula of the compound?

    A) \[{{C}_{2}}{{H}_{5}}{{N}_{2}}\]

    B) \[{{C}_{2}}{{H}_{5}}N\]

    C) \[{{C}_{2}}{{H}_{7}}N\]

    D) \[{{C}_{2}}{{H}_{6}}N\]

    Correct Answer: C

    Solution :

      Element                  No. of Moles         Simple Ratio
    C = 53.3 53.3/12 = 4.44 2
    H = 15.6 15.6/1 = 15.6 7
    N = 31.1 31.1/14 = 2.22 1
    Hence, formula = \[{{C}_{2}}{{H}_{7}}N\] \[(C{{H}_{3}}C{{H}_{2}}N{{H}_{2}})\].


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