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20.2.2 Describe and explain rates of nucleophilic substitution IB Chemistry

Describe and explain how the rate of nucleophilic substitution in halogenoalkanes by the hydroxide ion depends on the identity of the halogen. C-F bonds are more polar than C-I so you may think that a nucleophile such as OH- would attracted to the more positive carbon in C-F. BUT C-I has a weaker bond than C-F and it is this that is the more important factor (C-I takes less energy to break). So fluoroalkanes react slower than iodoalkanes. Thrilling stuff eh!
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