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Arrange the following monomers in order ...

Arrange the following monomers in order of decreasing reactivity in cationic polymerization.
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The reactivity of substituted syyrenes towards cationic polymerization decreaes as the stability of the intermediate carbocations (formed as a result of addition of a proton to the alkene ) decreases. Since the stability of the intermediate carbocation decreases in the order :

therefore , reactivity of the corresponding styrenes decreases in the same order ,i.e., `IV gt I gt II gt III`.
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