RAJASTHAN ­ PET Rajasthan PET Solved Paper-2007

  • question_answer
    The decreasing order of bond length of following , Ethane  Ethene  Ethyne

    A)  \[A>B>C\]       

    B)  \[B>A>C\]

    C)  \[C>B>A\]       

    D)  \[C>A>B\]

    Correct Answer: A

    Solution :

     Bond length \[\propto \frac{1}{Bond\text{ }order}\] Bond length decreases on increasing bond order \[\underset{\begin{smallmatrix}  \,\,\,\,\,\,\,\,\,\,\,\,\,\,ethane \\  Bond\text{ }order=1 \end{smallmatrix}}{\mathop{{{H}_{3}}C-C{{H}_{3}}}}\,>\underset{\begin{smallmatrix}  \,\,\,\,\,\,\,\,\,\,\,\,\,\,ethene \\  Bond\text{ }order=2 \end{smallmatrix}}{\mathop{{{H}_{2}}C=C{{H}_{2}}}}\,>\underset{\begin{smallmatrix}  \,\,\,\,\,\,\,\,\,\,\,\,\,\,ethyne \\  Bond\text{ }order=3 \end{smallmatrix}}{\mathop{H-C\equiv C-H}}\,\]


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