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NEET AIPMT SOLVED PAPER SCREENING 2008

  • question_answer
    Base strength of (A)\[{{H}_{3}}C\overset{\Theta }{\mathop{C}}\,{{H}_{2}}\]                         (B)\[{{H}_{2}}C=\overset{\Theta }{\mathop{C}}\,H\]and (C) \[H-C\equiv \overset{\Theta }{\mathop{C}}\,\]is in the order of

    A) (2) > (1) > (3)  

    B)        (3) > (2) > (1)     

    C) (1) > (3) > (2)     

    D) (1) > (2) > (3)

    Correct Answer: D

    Solution :

    Key Idea: Stronger the acid, weaker is its conjugate base. The strength of their conjugate acids are in the order: \[HC\equiv CH>{{H}_{2}}C=C{{H}_{2}}>C{{H}_{3}}-C{{H}_{3}}\] Therefore, the correct order of strength of their conjugate base is: \[C{{H}_{3}}C{{H}_{2}}^{\Theta }>{{H}_{2}}C=\overset{\Theta }{\mathop{C}}\,H>HC\equiv \overset{\Theta }{\mathop{C}}\,\]


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