JEE PYQ: Biomolecules And Polymers Question 27
Question 27 - 2020 (06 Sep Shift 1)
Consider the Assertion and Reason given below.
Assertion (A): Ethene polymerized in the presence of Ziegler Natta Catalyst at high temperature and pressure is used to make buckets and dustbins.
Reason (R): High density polymers are closely packed and are chemically inert.
(1) (A) is correct but (R) is wrong.
(2) Both (A) and (R) are correct and (R) is not the correct explanation of (A).
(3) Both (A) and (R) are correct but (R) is the correct explanation of (A).
(4) (A) and (R) both are wrong.
Show Answer
Answer: (3)
Solution
High density polythene is formed when addition polymerisation of ethene takes place in the presence of a catalyst (Ziegler Natta catalyst) at a high temp. (333K to 349 K) and under low pressure (6-7 atm). High density polyethene is hard and chemically inert due to close packing, that’s why used to make buckets and dustbins.
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