Haryana PMT Haryana PMT Solved Paper-1999

  • question_answer
    Which one of the following \[C-H\] bonds is the weakest for homolytic fission?

    A)  \[C{{H}_{3}}-H\]

    B)  \[{{({{C}_{6}}{{H}_{5}})}_{3}}C{{H}_{2}}-H\]

    C)  \[{{C}_{6}}{{H}_{5}}-H\]

    D)  \[{{({{C}_{6}}{{H}_{5}})}_{3}}C-H\]

    Correct Answer: B

    Solution :

                    \[\underset{Triphenyl\,methane}{\mathop{{{({{C}_{6}}{{H}_{5}})}_{3}}C-H}}\,\xrightarrow[Energy]{Least}\underset{\begin{align}   & ~~~~~~~~~~~~~~ \\  & ~~Triphenyl\text{ }methane~~~~~~~~~~~~~~~~~ \\  & Triphenyl\text{ }methyl. \\  & free\text{ }radical,\text{ }a\text{ }long\text{ }level \\  & \text{ }free. \\  & radical\text{ }highly\text{ }stable~~ \\  & ~due\text{ }to\text{ }resonance \\ \end{align}}{\mathop{{{({{C}_{6}}{{H}_{5}})}_{3}}\overset{\centerdot }{\mathop{C}}\,+\overset{\centerdot }{\mathop{H}}\,}}\,\]


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