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Question

The difference in the densities of low-density (LDP) and high-density polymers (HDP) is due to the fact that:

A
LDP are highly branched structures while HDP consists of closely packed linear molecules
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B
LDP are linear chains while HDP are branched chains of polythene
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C
both LDP and HDP are unbranched linear chains with different lengths
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D
at high temperature, the density of polymer is reduced
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Solution

The correct option is A LDP are highly branched structures while HDP consists of closely packed linear molecules
LDP obtained through the free radical addition and H-atom abstraction has highly branched structure. Due to this branching, the density of LDP becomes low.
Whereas HDP is obtained when addition polymerisation of ethene takes place in a hydrocarbon solvent in the presence of a catalyst such as triethylaluminium and titanium tetrachloride. It consists of linear molecules and has a high density due to close packing.

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