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The decreasing order of reactivity towards electrophilic addition (e.g. addition of `HX,X_(2),` etc.) of the following is `:` `I. CH-= CH` `II. CH_(2)=CH_(2)` `III.` `H_(2)C=CH-Cl` `IV` A. `(II)gt(I)gt(III)gt(IV)`B. `(I)gt(II)gt(III)gt(IV)`C. `(IV)gt(III)gt(I)gt(II)`D. `(IV)gt(III)gt(II)gt(I)` |
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Answer» Correct Answer - a The order of electrophilic addition `(EA)` is `:` alkene `gt` alkyne. But if alkene has `EWG`, reactivity of alkene is less than that of alkyne. Due to `EWG`, `vec(e)` dencity at `(C=C)` or nucleophilicity decreases, so addition of electrophile to `(C=C)` is slow. So the decreasing order of `EA` is `:` `(II)(`alkene `)gt(I)(`alkyne `)gt(III)(`alkene with one `EWG)gt(IV)(`alkene with two `EWG)` |
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