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Question 38 of 40

Q.The catalyst used in addition polymerization of olefins is

(a) Ziegler-Natta catalyst
(b) Zeolite
(c) Wilkinson catalyst
(d) Pd-BaSO4
West Bengal WbchseWest Bengal HS (WBCHSE) Board 2026MCQ· 1mImportance★★★★★
95% · 38/40 Questions
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Ziegler-Natta catalyst (triethylaluminium + TiCl4) is the classic catalyst for addition (coordination) polymerisation of olefins, giving stereoregular, high-density polymers. Correct option (a).

Olefins such as ethene and propene undergo addition polymerisation on a Ziegler-Natta catalyst (a combination of an aluminium alkyl like Al(C2H5)3 and a transition-metal halide like TiCl4). It enables low-pressure polymerisation and gives linear, high-density and stereoregular polymers.

  • Zeolite is a shape-selective catalyst (cracking, isomerisation), not olefin polymerisation. …
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