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Interparicle forces in nylon-66 are

$\begin{array}{1 1}(a)\;\text{dipole-dipole interactions}\\(b)\; \text{hydrogen bonding}\\(c)\;\text{vander wall's forces}\\(d)\;\text{ionic bonds}\end{array}$

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The monomer units of nylon-6,6 are hexamethylene diamine and adipic acid
When we're talking about nylons,the most important intermolecular force is hydrogen bonding.The nitrogen-bonded hydrogen of one nylon chain will hydrogen bond very strongly with the carbonyl oxygens of another nylon chain.These hydrogen bonds make crystals of nylon very strong because they hold the nylon chains together very tightly.
Hence (b) is the correct answer.
answered Mar 14, 2014 by sreemathi.v
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