Write chemical reaction for preparation of Teflon.(b) Write structure of monomer of natural rubber.(c) Give two uses of high density polyethene [HDP].

Q.25 (a) Write chemical reaction for preparation of Teflon.
(b) Write structure of monomer of natural rubber.
(c) Give two uses of high density polyethene [HDP].

Doubtly Asked 28 Oct 2026 Board exam · July 2025 hsc 12th Save WhatsApp Report

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(a) Teflon is made by addition polymerisation of tetrafluoroethylene heated with a free radical (peroxide/persulphate) catalyst under high pressure:
n CF₂=CF₂ → –[CF₂–CF₂]–_n (polytetrafluoroethylene)

(b) The monomer of natural rubber is isoprene (2-methylbuta-1,3-diene): CH₂=C(CH₃)–CH=CH₂. Natural rubber is cis-1,4-polyisoprene.

(c) Uses of HDPE:

Manufacture of containers such as buckets, dustbins, bottles and pipes.
Manufacture of toys, housewares and grocery bags.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report

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Write chemical reaction for preparation of Teflon.(b) Write structure of monomer of natural rubber.(c) Give two uses of high density polyethene [HDP].

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