This set of Polymer Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Olefin Metathesis and Metathesis Polymerization”.
1. What is the special feature of the olefin metathesis and metathesis polymerization?
a) use of initiators
b) use of catalysts with high potential
c) use of solvents
d) none of the mentioned
View Answer
Explanation: The special feature of this process is the use of catalyst with novel selectivity and high potential for effective chemical transformations for olefin metathesis.
2. What is the main driving force of the ring-opening metathesis polymerization reaction?
a) solvent concentration
b) relief of ring strain
c) catalyst activity
d) all of the mentioned
View Answer
Explanation: The main driving force of the ROMP reaction is the relief of ring strain.
When the metal carbene attacks the double bond of the ring, it gives rise to highly strained intermediate. The ring then opens to give the beginning of the polymer.
3. Which of the following features are dependent on the solvent used in ring opening metathesis polymerization reaction?
a) rate of reaction
b) molecular weight
c) catalyst activity
d) all of the mentioned
View Answer
Explanation: The solvent used plays an important role in the formation of carbene and thus affect the catalytic activity. Moreover by altering the solvent in the reaction, the rate of the reaction and the molecular weight of the polymer to be formed can be varied.
4. Which of the following functional group on the ring system poisoned the Grubb’s catalyst for the first time?
a) nitrile group
b) oxygenate groups
c) sulphate groups
d) hydrate groups
View Answer
Explanation: Nitrile or amine groups poisoned the Grubb’s catalyst for the first time.
5. Which of the following substituent groups on the ring system can affect the Molybdenum or tungsten metathetic catalyst in ROMP?
a) oxygenate group
b) sulphate groups
c) amine groups
d) hydrate groups
View Answer
Explanation: Molybdenum or Tungsten metathetic catalyst are affected by the oxygenate and nitrogenous groups attached to the ring in ROMP polymerization. The substituent groups can deleteriously react with the catalysts and affect its activity.
6. How does Norbornene epoxide affect the rate of ROMP reaction if RuCl3 and alcohol mixture is used as a catalyst?
a) increases
b) decreases
c) no change
d) cannot be determined
View Answer
Explanation: This happens due to the production of metalloxacyclobutane complex, which directly gives the ruthenium trichloride carbene complex upon metathetic opening.
7. The formation of a regular polymer with regular double bonds contributes to the usefulness of the ROMP process. State true or false.
a) true
b) false
View Answer
Explanation: The ROMP process is useful because of the formation of a regular polymer with regular number of double bonds. Thus the final product is available for the partial or total hydrogenation to form more complex compounds.
Sanfoundry Global Education & Learning Series – Polymer Engineering.
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