The relative rate of reaction of the followin | vedclass

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(D) The reaction of amines with methyl iodide is a nucleophilic substitution reaction $(S_N2)$.For the same nucleophilic atom (nitrogen),the nucleophi

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$B > A > C$

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(D) The reaction of amines with methyl iodide is a nucleophilic substitution reaction $(S_N2)$.For the same nucleophilic atom (nitrogen),the nucleophilicity is directly proportional to the basicity of the amine.Structure $(A)$ is triethylamine,which is a flexible tertiary amine.Structure $(B)$ is quinuclidine,a rigid bicyclic amine where the lone pair is more available due to less steric hindrance compared to $(A)$ and $(C)$.Structure $(C)$ is $DABCO$ ($1$,$4$-diazabicyclo[$2.2$.$2$]octane),where the lone pair on one nitrogen is involved in resonance/inductive effects of the other nitrogen,reducing its basicity and nucleophilicity compared to $(B)$.Thus,the order of basicity and nucleophilicity is $B > A > C$.

The relative rate of reaction of the following amines with methyl iodide is:

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