JIPMER Jipmer Medical Solved Paper-2007

  • question_answer
    Which of the following is the electron deficient molecule?

    A)  \[{{B}_{2}}{{H}_{6}}\]   

    B)                                         \[{{C}_{2}}{{H}_{6}}\]   

    C)         \[p{{H}_{3}}\]                  

    D)         \[Si{{H}_{4}}\]

    Correct Answer: A

    Solution :

    \[{{B}_{2}}{{H}_{6}}\] is electron deficient molecule because boron atom has three half-filled orbitals in excited state. The structure of\[{{B}_{2}}{{H}_{6}}\]is represented as follows: In it two electrons of a B?H bond are involved in formation of three centre bond, these bonds are represented as dotted lines.


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