Bissoy.com
Doctors Medicines MCQs Q&A

How is the rate of cationic polymerization reaction affected with the increase in the dielectric constant of the reaction medium?

How is the rate of cationic polymerization reaction affected with the increase in the dielectric constant of the reaction medium? Correct Answer increase

The increase in dielectric constant of reaction medium increases the initiation rate constant, ki by decreasing the energy required for charge separation and simultaneously, it decreases the termination constant, kt by increasing the energy required for arrangement or combination of ion pair. Since, Rp is directly proportional to the ratio ki/kt, an increase in the dielectric constant of reaction medium will increase the rate of reaction.

Related Questions

How does degree of polymerization affected with increase in temperature of cationic polymerization reaction?
For the reaction, A = X + Y, the respective concentrations are CA, CX and CY. The forward reaction rate constant is kf and the backward reaction rate constant is kb. Choose the correct statement from the following:
P. At equilibrium, kf CA > kB CxCy
Q. If the reaction is irreversible than, kb CXCY = 0
R. The backward reaction rate will essentially be first order, if the forward reaction rate is first order.
S. Activation energy for the first order forward reaction will be independent of temperature.
There are two medium L1 and L2 of refractive index n1 and n2 respectively (n2  > n1 > 1). In which of the following condition the total internal reflection may occur: a) When the light travel from medium L1 to medium L2. b) When the light travels from medium L2 to medium L1. c) When the light travel from medium L1 to air. d) When the light travels from air to medium L2. Which of the following statement is correct?
How is the rate of polymerization dependent on the concentration of catalyst in cationic polymerization?
What is the range of activation energy of overall polymerization of cationic polymerization?
If a dielectric resonator has a dielectric constant of 49, then the reflection coefficient of the dielectric resonator is:
Two dielectric materials A and B exhibit both ionic and orientational polarizabilities. The variation of their susceptibilities $$\chi \left( { = {\varepsilon _r} - 1} \right)$$   with temperature T is shown in the figure, where $${\varepsilon _r}$$ is the relative dielectric constant. It can be inferred from the figure that
Solid State Physics mcq question image
Which one of the following sets is incorrect to show the inter-relationships among price elasticity coefficient, change in price and change in total revenue ? Price elasticity coefficient Change in price Change in Total Revenue 1) Zero Increase Decrease Increase Decrease (2) Less than 1 Increase Decrease Decrease Increase (3) Equal to 1 Increase Decrease No change No change (4) More than 1 Increase Decrease Decrease Increase  
Which of the following statements are true/false?
1. A minimum rate of wages for the time spent by employees for the production of output is minimum time rate.
2. Minimum piece rate is the rate based on the quantity of the output employees have produced.
3. The guaranteed time rate is a minimum rate of remuneration to apply in the case of employees employed on piece work for the purpose of securing to such employees a minimum rate of wages on a time work basis.
4. A minimum rate of remuneration to apply in the case of employees employed on piece work for the purpose of securing to such employees a minimum rate of wages on a time work basis is overtime rate.
Consider the following statements with reference to evaporation : 1. Rate of evaporation decrease with an increase in surface area. 2. Rate of evaporation increases with an Increase in temperature. 3. Rate of evaporation decreases with an increase in humidity. 4. Rate of evaporation increases with an increase in wind speed. Which of the above statement are correct?