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

  • question_answer A compound has an empirical formula \[{{C}_{2}}{{H}_{4}}O\]. An independent analysis gave a value of 132.16 for its molecular mass. What is the correct molecular formula [Kerala PMT 2004]

    A) \[{{C}_{4}}{{H}_{4}}{{O}_{5}}\]

    B) \[{{C}_{10}}{{H}_{12}}\]

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

    D) \[{{C}_{6}}{{H}_{12}}{{O}_{3}}\]

    E) \[{{C}_{4}}{{H}_{8}}{{O}_{5}}\]

    Correct Answer: D

    Solution :

    Empirical formula weight \[{{C}_{2}}{{H}_{4}}O\] \[=(12\times 2+4+16)=44\] Molecular formula \[=\frac{\text{mol}\text{. wt}}{\text{eq}\text{. formula wt}\text{.}}\times \] Emp. Formula \[=\frac{132.1}{44}\times \text{Emperical formula}\] \[=3\times {{C}_{2}}{{H}_{4}}O={{C}_{6}}{{H}_{12}}{{O}_{3}}\]

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