NEET AIPMT SOLVED PAPER SCREENING 2005

  • 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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