MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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) |
| Answer» E. | |
| 2. |
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 |
| Answer» C. Remains same | |
| 3. |
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 |
| Answer» B. increases | |
| 4. |
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 |
| Answer» B. Compound which bears both alkene and azide functional group | |
| 5. |
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 |
| Answer» B. isocyanate and alcohol | |
| 6. |
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 |
| Answer» C. Polysiloxane | |
| 7. |
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 |
| Answer» D. Rapid loss of monomer early in the reaction | |
| 8. |
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 catalysed by transition metal salts and complexes |
| C. | monomers react by eliminating small molecules like H<sub>2</sub>O, NH<sub>3</sub>, CH<sub>2</sub>O 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 |
| Answer» E. | |