CMC Medical CMC-Medical VELLORE Solved Paper-2010

  • question_answer
    Which of the following has least covalent \[P-H\]bond?

    A)  \[P{{H}_{3}}\]                  

    B)  \[{{P}_{2}}{{H}_{6}}\]

    C)  \[{{P}_{2}}{{H}_{5}}\]                   

    D)  \[PH_{6}^{+}\]

    E)  None of these

    Correct Answer: D

    Solution :

                    Due to the presence of positive charge on P it attracts the electrons of the \[P-H\] bond towards itself. Consequently, the bond has some ionic character. In other words, the \[P-H\] bond in \[PH_{0}^{+}\] is least covalent.


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