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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pl233

A short fragment of a polymer chain (three repeat units, end groups shown) is drawn. Select all correct statements.

  1. AThe monomer unit implied by the repeat unit, the enol, is unstable and converts to ethanal, so the polymer is made indirectly
  2. BThe polymer can be prepared by hydrolysing poly(vinyl acetate)
  3. CIt is a condensation polymer formed from ethane-1,2-diol
  4. DThe main chain consists only of C-C bonds, as in an addition polymer

Answer: A, B, D

The polymer is poly(vinyl alcohol). Its monomer, vinyl alcohol, tautomerises at once to ethanal, so the polymer is made by hydrolysing poly(vinyl acetate), which has an all-carbon backbone. Statements A, B and D are therefore correct, while C is wrong because ethane-1,2-diol would give a polyether or polyester chain with oxygen in the backbone, not this C-C backbone.
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