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These electron donating groups will be a...

These electron donating groups will be able to stabilize the chain carrying carbocation intermediate. Greater the stability of the carbocation intermediate, more facile is the cationic polymer
What is the following readily undergoes cataionic polymerization ?

A

`H_(2)SO_(4)`

B

HF

C

`BF_(3)`

D

All

Text Solution

Verified by Experts

The correct Answer is:
D
Acids are cationic polymerisation initiator (a) `H_(2)SO_(4)` (b) HF, (c) `BF_(3)`
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The products of bond breaking, shown below, are not stable, and cannot be isolated for prolonged study. Such species are referred to as reactive intermediate, and are belived to be transient intermediates in many reactions. The general structures and names of four such intermediates are, Charged Intermediates Uncharged Intermediates Carbocations (called carbonium ions in the older literature) are electrophiles and carbananions are nucleophiles. Carbenes have only a valence shell sextet of electrons and are therefore electron deficient. In this sense they are elecrophiles, but the non-bonding electron pair also gives carbenes nucleophilic character. As a rule, the electrophilic character dominates carbene reactivity. Carbon radicals have only seven valence electrons, and may be considered electron deficient, however, they do not in general bond to nucleophilic electron pair, so their chemistry exhibits differences from that of conventional electrophiles. Radical intermediates are often called free radicals. Intermediates are in general stabilised with conjugation, electron donating and electron with drawing groups. Which of the following carbo cations is more stable?

An ion catalysed polymerization occurs in case of vinyl monomers with electron with drawing groups greater the stability of the carbane ion intermediate more facile is the an ionic polymerization Which of the following vinyl substituted group more stabilizes the carbaneion ?

Knowledge Check

  • These electron donating groups will be able to stabilize the chain carrying carbocation intermediate. Greater the stability of the carbocation intermediate, more facile is the cationic polymer Which of the following readily undergoes cataionic polymerization ?

    A
    `CH_(2) = CH-CN`
    B
    `CH_(2)=CH-CH_(3)`
    C
    `CH_(2)=CH-C_(6)H_(5)`
    D
    None

  • These electron donating groups will be able to stabilize the chain carrying carbocation intermediate. Greater the stability of the carbocation intermediate, more facile is the cationic polymer In presence which group readily undergo vinylic cationic polymerization ?

    A
    `-NO_(2)`
    B
    `-CF_(3)`
    C
    `-C Cl_(3)`
    D
    `-CH_(2)`

  • An ion catalysed polymerization occurs in case of vinyl monomers with electron with drawing groups greater the stability of the carbane ion intermediate more facile is the an ionic polymerization Which of the following more reactive in an ionic polymerization ?

    A
    `CH_(2) = CH - CN`
    B
    `CH_(2) = CH - COOCH_(3)`
    C
    `CH_(2) = CH - CH_(3)`
    D
    `CH_(2) = CH-Cl`

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    Polymerization involves various mechanisms depending upon the initiator. If initiator generates free radical, addition polymerization takes place through free radical mechanisms. If H^(+) is initiator and electron releasing group is present, cationic polymerization takes place. IF electron withdrawing group is present and KNH_(3) is initiator, anionic polymerization takes place. Which of the following will undergo anionic polymerization in presence of KNH_(2)

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