CH1012
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7
DIVISIONS
Mechanisms
• The next 2 examples of substitution rxns proceed by different mechanisms. 
• These mechanisms were determined by looking at the observed products and studying the reaction kinetics.
eg1 CH4  +  Cl-Cl   (hu)   ®  CH3Cl   +   HCl
eg2 CH3CH2Cl  + Na+I-    ®  CH3CH2I  + Na+Cl-
To describe the differences between such mechanisms we will need some new terminology.