JEE Main & Advanced Sample Paper JEE Main Sample Paper-4

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

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

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

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

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

    Correct Answer: A

    Solution :

    \[C{{H}_{3}}CH_{2}^{-}>NH_{2}^{-}>H-C\equiv {{C}^{-}}>H{{O}^{-}}\] It is because the order of acid - strength of their conjugate acid is\[C{{H}_{3}}C{{H}_{3}}<N{{H}_{3}}<H-C\]\[\equiv C-H<{{H}_{2}}O:\] Acid strength.    

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