NEET UG CHEMISTRY MCQ: POLYMERS

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Consider following statements
I. Cationic polymerization occurs in monomers with electron donation substitutents.
II. Anionic polymerization occurs in monomers with electron-withdrawing substitutents.
III. Head-to-head chain growth polymerisation occurs in polystyrene
Select correct statements

View answer and explanation

Correct option: A

I,II

Option A (I,II) is correct because cationic polymerization is favored by electron-donating substituents, and anionic polymerization is favored by electron-withdrawing substituents.

More Questions from POLYMERS

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Arrange the following monomers in order of decreasing ability to undergo cationic polymerisation

\mathrm{I}\mathrm{.}\,\,\,\,\,\mathrm{N}{\mathrm{O}_2}{\mathrm{C}_6}{\mathrm{H}_5} - \mathrm{CH} = \mathrm{C}{\mathrm{H}_2}

\mathrm{II}\mathrm{.}\,\,\,\,\,\mathrm{C}{\mathrm{H}_2} = \mathrm{CH} - {\mathrm{C}_6}{\mathrm{H}_5}\mathrm{C}{\mathrm{H}_3}

\mathrm{III}\mathrm{.}\,\,\,\,\,\mathrm{C}{\mathrm{H}_2} = \mathrm{CH} - {\mathrm{C}_6}{\mathrm{H}_5}\mathrm{OC}{\mathrm{H}_3}

Thiokol is a Assertion: Vulcanisation of rubber increases its tensile strength.

Reason: Sulphur cross links are formed between poly-isoprene chains during vulcanisation. Select the correct statement. Which of the following type of forces are present in vulcanized rubber? Which of the following is not an example of addition polymer?