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.
Choose the correct answer from the following :
(1) Both (A) and (R) are correct but (R) is not the correct explanation of (A).
(2) Both (A) and (R) are correct and (R) is the correct explanation of (A).
(3) (A) is correct but (R) is wrong.
(4) (A) and (R) both are wrong.
(2) Both (A) and (R) are correct and (R) is the correct explanation of (A).
Explanation:
High density polythene: It is formed when addition polymerisation of ethene takes place in a hydrocarbon solvent in the presence of a catalyst such as triethylaluminium and titanium tetrachloride (Ziegler-Natta catalyst) at a temperature of 333 K to 343 K and under a pressure of 6-7 atmospheres. High density polythene (HDP) thus produced, consists of linear molecules and has a high density due to close packing. It is also chemically inert and more tougher and harder. It is used for manufacturing buckets, dustbins, bottles, pipes, etc.