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JEE Advanced · 2019 · 27 May 2019 · Paper 2 · Polymers

Choose the correct option(s) from the following

(A)Natural rubber is polyisoprene containing trans alkene units
(B)Nylon-6 has amide linkages✓ Correct
(C)Cellulose has only $α$ -D-glucose units that are joined by glycosidic linkages
(D)Teflon prepared by heating tetrafluoroethene in presence of a persulphate catalyst at high pressure✓ Correct

Answer: (B), (D)

Solution

Option (A): Natural rubber is polyisoprene containing cis alkene units, not trans. ✗

Option (B): Nylon-6 has the structure $[HN - (CH_{2})_{5} - CO]_{n}$ , which contains amide linkages. ✓

Option (C): Cellulose has only ** $β$ -D-glucose** units, not $α$ -D-glucose. ✗

Option (D): Teflon is prepared by polymerizing tetrafluoroethene ( $F_{2} C = CF_{2}$ ) in the presence of a persulphate catalyst at high pressure. ✓

Correct answers: (2) and (4).

JEE Advanced · 2019 · 27 May 2019 · Paper 2 · One or more correct options

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