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Chain Transfer MCQ Questions & Answers

Chain Transfer MCQs : This section focuses on the "Chain Transfer". These Multiple Choice Questions (MCQs) should be practiced to improve the Chain Transfer skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

How does the value of solvent transfer constant, CS vary in the solvents with increasing substitution at the α-carbon?

A. increases
B. decreases
C. constant
D. none of the mentioned

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Question 2

How is the value of average degree of polymerization defined, considering the chain transfer mechanism?

A. ratio of overall rate of polymerization to total rate of production of pairs of chain ends
B. ratio of total rate of production of chain ends to overall rate of polymerization
C. ratio of overall rate of polymerization to rate of formation of pairs of chain ends by chain transfer
D. ratio of rate of formation of pairs of chain ends by chain transfer to overall rate of polymerization

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Question 3

The molecular weight of the polymer, when styrene is polymerized at 60ᵒC, is halved by diluting it with ethyl benzene. What is the value of transfer constant to the solvent, if the dilution factor is 7 and the term 1/Xn0 is 4.8*10-4?

A. 0.335
B. 0.68
C. 1.5
D. 0.82

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Question 4

The transfer constant to the solvent for polymerization of of styrene in toluene at 60ᵒC is 0.125*10-5. How much dilution is required to decrease the molecular weight by 4 times when 1/Xn0 is 3.5*10-4?

A. 75
B. 42
C. 84
D. 7

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Question 5

What does the effect of chain transfer on Rp depend on?

A. re-initiation rate constant, ki’
B. monomer concentration
C. ki’/kp
D. none of the mentioned

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Question 6

What is the effect of polymer transfer on the polymer product formed by radical polymerization?

A. becomes less crystallizable
B. becomes mechanically weak
C. becomes less resistant to foreign agents
D. all of the mentioned

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Question 7

What is the slope of the linear plot of log [S] v/s log [M] in significant solvent transfer mechanism?

A. CM
B. CS
C. ktr,S
D. CI

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Question 8

What is the value of chain transfer constant for a transfer agent?

A. rate constant for chain transfer reaction, ktr
B. product of ktr and kp
C. ratio of ktr to kp
D. none of the mentioned

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Question 9

What is the value of intercept and slope of the straight line, when the term [1/Xn– [(y+2)/(y+1)](kt/kp2)(Rp/[M]2)] is plotted against the ratio [I]/[M], when both monomer and initiator transfer are considered?

A. CM, CI
B. CI, CM
C. 0, CI
D. none of the mentioned

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Question 10

What is the value of intercept, when (1/Xn) is plotted against Rp, if only monomer transfer has a significant occurence?

A. 0
B. CM
C. CI
D. [I]

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Question 11

Which of the following solvents is not useful for controlling the degree of polymerization?

A. carbon tetra-bromide
B. pentaphenyl ethane
C. t-butyl mercaptan
D. toluene

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