Class 12 Chemistry Haloalkanes and Haloarenes E2 reaction

E2 reaction

It’s a biomolecular reaction. It is a single step reaction whose rate depends on the concentration of base and substrate. Reactivity depends on both strength of base and nature of alkyl halide. Order of reactivity for E1 reaction is 30 >  20   >  10. This reaction proceeds at room temperature.

Example:

General mechanism:

Stereochemistry of E2 reaction:

E2 eliminations may or may not lead to the more stable stereochemistry. Initial material for this reaction has two sp3 hybridized carbons which on rehybridization forms two sp2 hybridized carbons. The C-X bond and the C-H bond lines up in the same plane and faces in anti directions to each other.

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