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# Which of the following is used as a catalyst in the preparation of high density polythene(HDP)?

$\begin{array}{1 1}(a)\;\text{Persulphate catalyst}\\(b)\; \text{Zeigler-Natta catalyst}\\(c)\;\text{Traces of oxygen}\\(d)\;\text{Fe slices}\end{array}$

HDP is prepared by heating ethene in a hydrocarbon solvent at about 333-343K under a pressure of 6-7 atmosphere in the presence of a catalyst such as triethyaluminium & titanium tetrachloride (known as Zeigler-Natta catalyst)
$nCH_2=CH_2\quad\underrightarrow{333-343K,6-7atm}\quad -(CH_2-CH_2-)_n$
Hence (b) is the correct answer.