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AIIMS 2017
Exam
AIIMS
Year
2017
Subject
Chemistry
Chapter
Polymers

AIIMS 2017 · Chemistry · Polymers

Arrange the following monomers in order of decreasing ability to...

Arrange the following monomers in order of decreasing ability to undergo cationic polymerisation. I. CH2=CH−C6H4(NO2)\mathrm{CH}_2=\mathrm{CH}-\mathrm{C}_6 \mathrm{H}_4\left(\mathrm{NO}_2\right) II. CH2=CH−C6H4(CH3)\mathrm{CH}_2=\mathrm{CH}-\mathrm{C}_6 \mathrm{H}_4\left(\mathrm{CH}_3\right) III. \mathrm{CH}_2=\mathrm{CH}-\mathrm{C}_6 \mathrm{H}_4\left(\mathrm{OCH}_3\right)Arrange the following monomers in order of decreasing ability to undergo cationic polymerisation. I. CH_2=CH-C_6Arrange the following monomers in order of decreasing ability to undergo cationic polymerisation. I. CH_2=CH-C_6

Options

  1. AI >> II >> III
  2. BII >> I >> III
  3. CIII >> II >> I
  4. DI >> III >> II

Correct answer

C. III >> II >> I

Step-by-step solution

Electron releasing groups such as −CH3,−OCH3-\mathrm{CH}_3,-\mathrm{OCH}_3 activate the monomer towards cationic polymerisation because these groups provide stability to the carbocation formed. On the other hand, −NO2-\mathrm{NO}_2 is a electron withdrawing group. So, it reduces the stability of carbocation formed. Thus, the correct order is Arrange the following monomers in order of decreasing ability to undergo cationic polymerisation. I. CH_2=CH-C_6
Arrange the following monomers in order of decreasing ability to undergo cationic polymerisation. I. CH_2=CH-C_6
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