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The decreasing order of reactivity towar...

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)`

Text Solution

Verified by Experts

The correct Answer is:
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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