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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1996

  • question_answer
    Arrange the following acids in the ascending order of their \[_{p}{{K}_{a}}\] values:
    (1) formic acid
    (2) chloroacetic acid
    (3) acetic acid
    (4) trichloroacetic acid

    A)  \[4,2,1,3~\]                       

    B)                         \[4,1,2,3\]                         

    C)                         \[1,2,3,4\]                         

    D)                         \[4,3,2,1\]

    Correct Answer: A

    Solution :

    Weak acid has high \[_{p}{{K}_{a}}\] value. The \[_{p}{{K}_{a}}\] value of trichloroacetic acid very high Trichloro acetic acid chloro acetic acid > formic acid > acetic acid.


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