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JEE Main & Advanced Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना Question Bank Critical Thinking

  • question_answer
    The correct order of increasing \[C-O\] bond length of \[CO,\,\,CO_{3}^{2-},\,\,C{{O}_{2}}\] is                                   [IIT 1999]

    A)                 \[CO_{3}^{2-}<C{{O}_{2}}<CO\]               

    B)                 \[C{{O}_{2}}<CO_{3}^{2-}<CO\]

    C)                 \[CO<CO_{3}^{2-}<C{{O}_{2}}\]               

    D)                 \[CO<C{{O}_{2}}<CO_{3}^{2-}\]

    Correct Answer: D

    Solution :

                    B.O. in CO i.e., \[:\overset{-}{\mathop{C}}\,=\overset{+}{\mathop{O}}\,:\] is 3, that of \[O=C=O\] is 2 while that of \[CO_{3}^{2-}\] ion is 1.33. Since the bond length increases as the bond order decreases i.e. \[CO<C{{O}_{2}}<CO_{3}^{2-}\]. Thus option D is correct.


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