J & K CET Medical J & K - CET Medical Solved Paper-2002

  • question_answer
    Which is the correct order of decreasing strength?

    A) \[ClC{{H}_{2}}COOH>C{{H}_{3}}COOH>HCOOH>\]\[{{C}_{6}}{{H}_{5}}OH\]

    B)  \[ClC{{H}_{2}}COOH>HCOOH>C{{H}_{3}}COOH>\]\[{{C}_{6}}{{H}_{5}}OH\]

    C)  \[ClC{{H}_{2}}COOH>HCOOH>{{C}_{6}}{{H}_{5}}OH>\]\[C{{H}_{3}}COOH\]

    D)  \[ClC{{H}_{2}}COOH>C{{H}_{3}}COOH>{{C}_{6}}{{H}_{5}}OH>\]\[HCOOH\]

    Correct Answer: B

    Solution :

                    The acidic strength of acid increases by\[-I\]effect of chlorine atom and decreases by\[+I\] effect of methyl group. Further, phenol is the less acidic than carboxylic acid because phenoxide ion is less stabilized by resonance than carboxylate ion. Hence, the order of acidic strength is as: \[ClC{{H}_{2}}COOH>HCOOH>C{{H}_{3}}COOH>{{C}_{6}}{{H}_{5}}OH\]


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