A) \[TiC{{l}_{3}}+Al{{({{C}_{2}}{{H}_{5}})}_{3}}\]
B) \[TiC{{l}_{4}}+Al{{({{C}_{2}}{{H}_{5}})}_{3}}\]
C) \[Ti{{({{C}_{2}}{{H}_{5}})}_{4}}+AlC{{l}_{3}}\]
D) \[Ti{{({{C}_{2}}{{H}_{5}})}_{3}}+AlC{{l}_{3}}\]
Correct Answer: B
Solution :
This problem includes conceptual mixing of Ziegler Natta polymerisation and catalyst involved in this polymerisation. Ziegler Natta polymerisation This polymerization proceeds through formation of coordination compound as intermediate. Catalyst used in this reaction is a mixture of \[{{({{C}_{2}}{{H}_{5}})}_{3}}\]AI and \[TiC{{l}_{4}}\]. The three possible stereo chemical arrangements are (i) A tactic (random arrangement)
(ii) Isotactic polymer (same arrangement) 
(iii) Syndiotactic (alternate arrangement) 
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