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Q.
What is the increasing order of reactivity of the following in an $E_{2}$ reaction with ethanolic $KOH$ solution?
Haloalkanes and Haloarenes
Solution:
(III) is most reactive as it has most acidic P-H as well as it gives resonance stabilized alkene. Next to (III) is (IV) as it is tertiary. (I) is less reactive than (II) because (I) gives less substituted alkene.
