NEET Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना NEET PYQ-Chemical Bonding Molecular

  • question_answer
    Which of the following diatomic molecular species has only \[\pi \] bonds according to Molecular Orbital Theory?                                                                                                                               [NEET 2019]

    A)  \[{{C}_{2}}\]              

    B)       \[B{{e}_{2}}\]

    C)  \[{{O}_{2}}\]              

    D)       \[{{N}_{2}}\]

    Correct Answer: A

    Solution :

    [a] \[{{C}_{2}}=\sigma 1{{s}^{2}}\text{ }\sigma *\text{ }1{{s}^{2}}\text{ }\sigma 2{{s}^{2}}\text{ }\sigma *2{{s}^{2}}\text{ }\]
    \[\pi 2p_{x}^{2}\,\pi 2p_{y}^{2}\]
    12 \[{{e}^{-}}\] has only \[\pi \] bonds according to M.O.T.
    In \[{{C}_{2}}\]molecule, only \[\pi \]electron occupied the bonding molecular orbital.


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