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

  • question_answer
    Which one of the following molecules contain no \[\text{ }\!\!\pi\!\!\text{ -}\]bond?                             [NEET 2013]

    A)  \[C{{O}_{2}}\]

    B)       \[{{H}_{2}}O\]           

    C)  \[S{{O}_{2}}\]            

    D)       \[N{{O}_{2}}\]

    Correct Answer: B

    Solution :

                          
    All the molecules have O atom with lone pairs, but in \[{{\text{H}}_{\text{2}}}\text{O}\] the H atom has no vacant orbital for \[\pi \] bonding. That's why it does not have any \[\pi \] bond.
    In all other given molecules, the central atom because of the presence of vacant orbital’s is capable to farm \[\pi \] bonds.


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