J & K CET Engineering J and K - CET Engineering Solved Paper-2012

  • question_answer
    The correct order of leaving group ability in a nucleophilic substitution reaction is

    A) \[B{{r}^{-}}>C{{l}^{-}}>C{{H}_{3}}CO_{2}^{-}>H{{O}^{-}}>{{H}^{-}}\]

    B)  \[{{H}^{-}}>O{{H}^{-}}>C{{H}_{3}}CO_{2}^{-}>C{{l}^{-}}>B{{r}^{-}}\]

    C)  \[B{{r}^{-}}C{{H}_{3}}CO_{2}^{-}C{{l}^{-}}>O{{H}^{-}}>{{H}^{-}}\]

    D)  \[C{{H}_{3}}CO_{2}^{-}>B{{r}^{-}}>C{{l}^{-}}>O{{H}^{-}}>{{H}^{-}}\]

    Correct Answer: A

    Solution :

     The correct order of leaving group ability in a nucleophilic substitution reaction is \[B{{r}^{-}}>C{{l}^{-}}>C{{H}_{3}}CO{{O}^{-}}>H{{O}^{-}}{{H}^{-}}\] Because the best leaving group is that which is conjugal base of strong acid.


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