CMC Medical CMC-Medical VELLORE Solved Paper-2012

  • question_answer
    Which of the following is the electro: 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 an 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 the formation of three centre bond, these bonds are represented as dotted lines.


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