NTA Abhyas JEE Main2020ChemistryPolymersPractice
Polyvinyl alcohol is an important polymer. The structure is given below It is prepared by polymerization of
Options
- AC H 2 = C H - O H
- BC H 2 = C H - O C O C H 3 , followed by hydrolysis
- CC H 2 = C H - C N , followed by hydrolysis
- DC H 2 = C H - C O O C H 3 , followed by hydrolysis
Correct answer
B. C H 2 = C H - O C O C H 3 , followed by hydrolysis
Step-by-step solution
PVA is prepared by hydrolysis of polyvinyl acetate. Other vinyl ester-derived polymers are sometimes used, with formate, chloroacetate groups instead of acetate. The conversion of the polyesters is usually conducted by base-catalysed transesterification with ethanol: C H 2 C H O A c n + C 2 H 5 O H → C H 2 C H O H n + C 2 H 5 O A c