Explanation

(c)
Ethylene glycol on reaction with terephthalic acid forms the polymer terylene(also known as Dacron or terene) which is used as synthetic fibre.
$n\ HOCH_{2}\ .\ CH_{2}OH + n\ HOOC\ .\ C_{6}H_{4}\ .\ COOH$
Ethylene glycol terephthalic acid
$\downarrow \ - n\ H_{2}O$
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