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Question:

The correct match between item - I and item - II is:
Item - I Item - II
(a) High-density polythene (I) Peroxide catalyst
(b) Polyacrylonitrile (II) Condensation at high temperature and pressure
(c) Novolac (III) Ziegler-Natta Catalyst
(d) Nylon6 (IV) Acid or base catalyst

(a)→(II),(b)→(IV),(c)→(I),(d)→(III)

(a)→(III),(b)→(I),(c)→(IV),(d)→(II)

(a)→(III),(b)→(I),(c)→(III),(d)→(IV)

(a)→(IV),(b)→(II),(c)→(I),(d)→(III)

Solution:

Correct option is D (a)→(III),(b)→(I),(c)→(IV),(d)→(II)
In high-density polyethene, two types of catalyst are used principally in the manufacture: a Ziegler-Natta organometallic catalyst (titanium compounds with an aluminium alkyl) and an inorganic compound, known as a Phillips-type catalyst.
The addition polymerisation of acrylonitrile in the presence of a peroxide catalyst leads to the formation of polyacrylonitrile. Polyacrylonitrile is used as a substitute for wool in making commercial fibres as orlon or Acrilan.
Novolac is obtained by acid /base. Catalyst polymerisation of formaldehyde phenol.
Nylon 6 is obtained by heating caprolactam with water at a high temperature and pressure.
Hence, option D is correct.