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NEET Chemistry Organic Chemistry: Some Basic Principles & Techniques / कार्बनिक रसायन : कुछ मूलभूत सिद्धांत एवं तकन Question Bank Self Evaluation Test - Organic Chemistry - Some Basic Principles & Techniques

  • question_answer
    What is the decreasing order of strength of the bases \[O{{H}^{-}},NH_{2}^{-},HC\equiv {{C}^{-}}~\] and \[C{{H}_{3}}CH_{2}^{-}\]?

    A) \[C{{H}_{3}}CH_{2}^{-}>NH_{2}^{-}>HC\equiv {{C}^{-}}>O{{H}^{-}}\]

    B) \[HC\equiv {{C}^{-}}>C{{H}_{3}}C{{H}_{2}}>NH_{2}^{-}>O{{H}^{-}}\]

    C) \[O{{H}^{-}}>NH_{2}^{-}>HC\equiv C{{~}^{-}}>C{{H}_{3}}CH_{2}^{-}\]

    D) \[NH_{2}^{-}>HC\equiv C{{~}^{-}}>O{{H}^{-}}>C{{H}_{3}}CH_{2}^{-}\]

    Correct Answer: A

    Solution :

    [a] Stronger the acid, weaker the conjugate base. Since acid character follows the order \[{{H}_{2}}O>HC\equiv CH>N{{H}_{3}}>C{{H}_{3}}-C{{H}_{3}}\] (Acid character), the basic character of their conjugate bases decreases in the reverse order, i.e., \[C{{H}_{3}}CH_{2}^{-}>NH_{2}^{-}>HC\equiv {{C}^{-}}~>O{{H}^{-}}\] (Basic character)


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