The activated complex in a reaction is
Correct answer: D. a short lived arrangement at the top of the energy barrier in which bonds are partly broken and partly formed
- A. a stable intermediate that can be isolated
- B. the same as the catalyst
- C. the product of the reaction
- D. a short lived arrangement at the top of the energy barrier in which bonds are partly broken and partly formed
Explanation
At the transition state old bonds are stretched and new ones are only beginning to form, so the species exists for the duration of a molecular vibration and cannot be isolated. A genuine reaction intermediate, by contrast, sits in an energy well and may sometimes be detected. The activated complex may collapse either forwards to products or backwards to reactants.
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About Activation Energy and Activated Complex
Activation energy is the minimum energy reactant particles need to form the activated complex, or transition state, during a reaction. Energy profile diagrams show the forward and reverse activation energies, while catalysts provide an alternative pathway with lower activation energy without changing the reaction enthalpy.
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