The intermediate in the free radical species. Rank the following radicals in ord

Question

The intermediate in the free radical species. Rank the following radicals in order of their stability. (Benzylic, 1 degree, 2 degree, 3 degree Aryl. Predict the order of reactivity for the reactants used in today's lab (Use the letters to fill in the spaces) Toluene Ethylbenzene Isopropylbenzene t - butylbenzene cyclohexane methylcyclohexane Least reactive Most Reactive Fill in the blanks: When the bromine is first added to the hydrocarbon solution, the color will be When the bromine has reacted with the hydrocarbon, the solution will become occurred or not. If no reaction, the solution will be

Explanation / Answer

8. Stability of free radicals

       aryl              <            1o        <            2o        <           3o          <                   benzylic

Least stable radical                                                                                   Most stable radical

9. Order of reactivity of substrates

         d               <           e        <          f           <         a          <      b         <         c

Least reactive                                                                                              Most reactive

10. When bromine is first added to the hydrocarbon, the color will be reddish-brown. When the bromine has reacted with the hydrocarbon, the solution will becomes colorless. This is how we can tell wheather the reaction has occured. If no reaction has occured, the reaction will be reddish-brown (colored).

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