WB JEE Medical WB JEE Medical Solved Paper-2013

  • question_answer
    Which of the following is electron deficient?

    A)  \[{{(C{{H}_{3}})}_{2}}\]

    B)  \[{{(Si{{H}_{3}})}_{2}}\]

    C)  \[{{(B{{H}_{3}})}_{2}}\]

    D)  \[P{{H}_{3}}\]

    Correct Answer: C

    Solution :

     Boron is an element of 13 group and contains three electrons in its valence shell, When its compound \[B{{H}_{3}}\]dimerises, each boron atom carry only \[6{{e}^{-}},\] that is their octet is incomplete. Hence, \[{{(B{{H}_{3}})}_{2}}\]is an electron deficient compound. In all other given molecules octet of central atom is complete.


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