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JEE Main & Advanced Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना Question Bank Self Evaluation Test - Chemical Bonding and Molecular Structure

  • question_answer
    Which of the correct increasing order of lone pair of electrons on the central atom?

    A) \[I{{F}_{7}}<I{{F}_{5}}<Cl{{F}_{3}}<Xe{{F}_{2}}\]

    B) \[I{{F}_{7}}<Xe{{F}_{2}}<Cl{{F}_{2}}<I{{F}_{5}}\]

    C) \[I{{F}_{7}}<Cl{{F}_{3}}<Xe{{F}_{2}}<I{{F}_{5}}\]

    D) \[I{{F}_{7}}<Xe{{F}_{2}}<I{{F}_{5}}<Cl{{F}_{3}}\]

    Correct Answer: A

    Solution :

    [a] The number of lone pairs of electrons on central atom in various given species are
    Species Number of lone pairs on central atom
    \[I{{F}_{7}}\] Nil
    \[I{{F}_{5}}\] 1
    \[Cl{{F}_{3}}\] 2
    \[Xe{{F}_{2}}\] 3
                    Thus the correct increasing order is \[\begin{align}   & I{{F}_{7}}<I{{F}_{5}}<Cl{{F}_{3}}<Xe{{F}_{2}} \\  & 0\,\,\,\,\,\,\,\,\,\,1\,\,\,\,\,\,\,\,\,\,\,\,2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3 \\ \end{align}\]


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