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Chemical Technology
Organic Chemical Industries
GATE 2015
Medium

Match the polymer with the catalyst used for its manufacture. I-LDPE, II-HDPE, III-PET, IV-PVC. P-Ziegler-Natta, Q-Traces of Oxygen, R-Butyl Lithium, S-Antimony. The correct combination is

  • AI-Q, II-R, III-S, IV-P
  • BI-S, II-P, III-Q, IV-R
  • I-Q, II-P, III-S, IV-R
  • DI-S, II-R, III-P, IV-Q

Explanation

LDPE uses trace-oxygen-initiated free-radical polymerization (Q). HDPE uses Ziegler-Natta (P). PET uses antimony-based polycondensation catalysts (S). PVC uses butyl lithium by elimination (R).

Source: GATE CH 2015 (2015)

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