Organic Chemistry Questions and Answers – Step Reaction Polymerisation

This set of Organic Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Step Reaction Polymerisation”.

MCQs based on Step Reaction Polymerisation:

1. Which of the following is true about Step-growth polymerisation?
a) radical, coordination, anionic, or cationic polymerization, depending on the type of initiation
b) polymerization that is catalyzed by transition metal salts and complexes
c) monomers react by eliminating small molecules like H2O, NH3, CH2O and NaCl in a repetitive manner, Indefinite growth of the polymer occurs at both ends
d) monomers react to form first dimers, then trimmers, longer oligomers and eventually long chain polymers


2. Which of the following is not true about step growth polymerisation?
a) Molar mass of backbone chain increases rapidly at early stage and remains approximately the same throughout the polymerization
b) Similar steps repeated throughout reaction process
c) Initiator are required for the step growth polymerisation
d) Rapid loss of monomer early in the reaction


3. Which of the following is polymer formed by step-growth polymerization is not classified under condensation polymerisation?
a) Polyester
b) Polyurethane
c) Polysiloxane
d) Polyamide


4. Which monomers are required for the formation of Bakelite via a typical step-growth polymerization?
a) phenol and formaldehyde
b) isocyanate and alcohol
c) diamine and formaldehyde
d) ester and phenol


5. Formation of polytriazole polymers via step-growth polymerization is produced from which of the following monomers?
a) Compound which bears both alkyne and azide functional group
b) Compound which bears both alkene and azide functional group
c) Compound which bears both alkane and azide functional group
d) Compound which bears both vinyl and azide functional group


6. How does the reaction rate vary with increasing extent of reaction beyond 94% conversion in self catalyzed reaction?
a) decreases
b) increases
c) remains same
d) first increases than decreases


7. What is the trend in the molecular weight of step growth polymer at lower conversion and higher conversion respectively?
a) Increase then decrease
b) Decreases an increases
c) Remains same
d) Can’t say about molecular weight


8. Which of the following is not prepared by Ziegler-Natta coordination polymerisation?
a) High density Polyethylene (HDPE)
b) Ultrahigh molecular weight Polyethylene (UHMWPE)
c) Ethylene-1-alkenebcopolymer (linear low density polyethylene, LLDPE)
d) Polyvinyl acetate (PVAc)

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