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# Which of the following is a monomer?

$\begin{array}{1 1}(a)\;\text{Polyesters}&(b)\; \text{Buna-S}\\(c)\;\text{Bakelite}&(d)\;\text{Adipic acid}\end{array}$

Adipic acid is a monomer which terms a co polymer Nylon-66,when reacts with Hexamethylene -diamine.Bina-s,polyesters,& bakelite are co-polymers of two or more different monomers.
Hence (d) is the correct answer.