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Q.

Which of the following is correct statement?

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a

High density polyethylene is obtained from ethylene by using Zeigler Natta catalyst

b

High density polyethylene has highly branched structure

c

High density polyethylene is more flexible than low density polyethylene

d

Low density polyethylene is obtained under high pressure and room temperature

answer is C.

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Detailed Solution

High density polythene is formed when addition polymerization of ethene takes place in a hydrocarbon solvent in the presence of a catalyst such as triethyl aluminium and titanium tetrachloride (Ziegler - Natta catalyst) at a temperature of 333 K to 343 K and under a pressure of 6-7 atmospheres.

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