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WB JEE Medical WB JEE Medical Solved Paper-2014

  • question_answer
    Among the following compounds, the one(s) that gives (give) effervescence with aqueous \[NaHC{{O}_{3}}\]solution is (are) \[\underset{\text{I}}{\mathop{{{\text{(C}{{\text{H}}_{\text{3}}}\text{CO)}}_{\text{2}}}\text{O}}}\,\,\,\underset{\text{II}}{\mathop{\,\,\text{C}{{\text{H}}_{\text{3}}}\text{COOH}\,\,\,\underset{\text{III}}{\mathop{\text{PhOH}}}\,\,\,}}\,\,\underset{\text{IV}}{\mathop{\text{C}{{\text{H}}_{\text{3}}}\text{COCHO}}}\,\]

    A)  I and II             

    B)  I and III

    C)  Only II             

    D)  I and IV

    Correct Answer: A

    Solution :

     Only carboxylic acids and their derivatives like anhydride are capable to give effervescence with aqueous \[\text{NaHC}{{\text{O}}_{\text{3}}}\]solution, because they are more acidic as compared to \[{{\text{H}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\](carbonic acid). \[\text{II}\,\text{C}{{\text{H}}_{3}}COOH+NaHC{{O}_{3}}\] \[\xrightarrow{{}}C{{H}_{3}}COONa+{{H}_{2}}O+C{{O}_{2}}\] \[\text{I}\,{{\text{(C}{{\text{H}}_{3}}\text{CO)}}_{2}}O+2NaHC{{O}_{3}}\] \[2C{{H}_{3}}COONa+{{H}_{2}}O+C{{O}_{2}}\]


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