Assertion : In vulcanisation of rubber,sulphu | vedclass

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Question

(C) Vulcanisation is a process of treating natural rubber with sulphur or some compounds of sulphur under heat to modify its properties. In this proce

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If the Assertion is correct but Reason is incorrect.

Vedclass · Answer

(C) Vulcanisation is a process of treating natural rubber with sulphur or some compounds of sulphur under heat to modify its properties. In this process,sulphur forms cross-links at the reactive sites of double bonds in the rubber chain,which provides mechanical strength and elasticity to the rubber. Therefore,the Assertion is correct. However,vulcanisation is not a free radical initiated chain reaction; it is a chemical cross-linking process. Thus,the Reason is incorrect.

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
$(d)$ Nylon-$6$	$(IV)$ Acid or base catalyst

Assertion : In vulcanisation of rubber,sulphur cross links are introduced.
Reason : Vulcanisation is a free radical initiated chain reaction.

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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

$(d)$ Nylon-$6$ $(IV)$ Acid or base catalyst

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Assertion : In vulcanisation of rubber,sulphur cross links are introduced.Reason : Vulcanisation is a free radical initiated chain reaction.