Consider the reaction of HCl with the following compounds
Propene(I); methyl-vinyl ether(II); vinyl chloride(III) and cis- $2$ -butene(IV). The increasing order reactivity towards addition reaction will be _______.

I < I I < I I I < I V

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I < I I < I V < I I I

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I I I < I < I V < I I

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I V < I I I < I I < I

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Solution

The correct option is B $I I I < I < I V < I I$
(I) propene carbocation $C H 3 - C H^{+} - C H 3$ (stable by electron donating character of of two $- C H 3$ groups.
(IV) CIS-2-butene carbocation $C H 3 - C H^{+} - C H 2 - C H 3$ (stable by electron donating character of of two $- C H 3$ and $- C H 2 - C H 3$ groups.
So order of reactivity is same as stability of carbocation
III<I<IV<II

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Consider the reaction of HCl with the following compounds Propene(I); methyl-vinyl ether(II); vinyl chloride(III) and cis-2-butene(IV). The increasing order reactivity towards addition reaction will be _______.

Consider the reaction of HCl with the following compounds
Propene(I); methyl-vinyl ether(II); vinyl chloride(III) and cis- $2$ -butene(IV). The increasing order reactivity towards addition reaction will be _______.