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Arrange the following alkenes towards or...

Arrange the following alkenes towards order of increasing reactivity in cationic polymerization:
`H_(2)C=CHCH_(3), CICH=CH_(2), H_(2)C=CHC_(6)H_(5)`,
`H_(2)C=CHCOOCH_(3)`

Text Solution

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Reactivity towards cationic polymerization increases as the stability of the inmtermediate carbocation increases. Since the stability of the intermediate carbocations increases in the order :
`H_(3)C-overset(+)(CH)-CO_(2)CH_(3)ltH_(3)C-overset(+)(CH)-CIlt CH_(3)-overset(+)(CH)-CH_(3)lt H_(3)C-overset(+)(CH)-C_(6)H_(5)`
therefore, reactivity of the corresponding alkenes towards cationic polymerization increases in the same order : `H_(2)C=CHCO_(2)CH_(3)lt H_(2)C=CHCI lt H_(2)C=CHCH_(3)lt CH_(2)=CHC_(6)H_(5)` .
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Knowledge Check

  • Arrange the following monomers in order of decreasing ability of undergo cationic polymerisation. (I) CH_(2)=CH-C_(6)H_(4)(NO_(2)) (II) CH_(2)=CH-(C_(6)H_(4)(CH_(3)) (III) CH_(2)=CH-C_(6)H_(4)(OCH_(3))

    A
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    B
    `IIgtIgtIII`
    C
    `IIIgtIIgtI`
    D
    `IgtIIIgtII`

  • Arrange the following compound in increasing order of reactivity towards nucleophilic addition reaction (I) C_(6)H_(5)COCH_(3) (II) CH_(3)CO - C_(2)H_(5) C_(6)H_(5)CHO (IV) CI - CH_(2) - CHO

    A
    IV `gt` III `gt` II `gt` I
    B
    IV `gt` II `gt` III `gt` I
    C
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    D
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  • Arrange the following compounds in increasing order of reactivity towards the addition of HBr RCH = CHR, C H_(2) = C H_(2) , R_(2) C = CHR, R_(2) = C R_(2)

    A
    `CH_(2)=CH_(2) lt RCH =CHR lt R_(2)C=CHR lt R_(2)C=CR_(2)`
    B
    `R_(2)C=CHR lt RCH=CHR lt CH_(2)=CH_(2)lt R_(2)C=CR_(2)`
    C
    `RCH=CHR lt R_(2)C=CR_(2) lt R_(2)C=CHR lt CH_(2)=CH_(2)`
    D
    `R_(2)C=CR_(2) lt CH_(2)=CH_(2) lt RCH=CHR lt R_(2)C=CHR`

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