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# Which of the following can be used as plasticizers?

$\begin {array} {1 1} (a)\;Cresyl\: phthalate & \quad (b)\;Polysterene \\ (c)\;Dimethyl\: phthalate & \quad (d)\;Trimethyl\: phosphate \end {array}$

phthalate esters, are esters of phthalic acid and are mainly used as plasticizers (substances adde,d to plastics to increase their flexibility ...
Ans : (a)