what are the answers of these questions? t. Shown below is the bromination of cy

Question

what are the answers of these questions?

t. Shown below is the bromination of cyclohexene. When the concentration of cyclohetene is doubled, the reaction rate doubles. When the concentration of bromine is doubled, the reaction rate quadruples (increases fourfold). What is the overall kinetic order? (A) Zeroth order Br (B) First order C) Second order Third order cyclohexene E) Fourth order 24. Which of the following reactions has two transition states in its energy diagram? (A) SNI only (B) SN2 only (C) El only (D) E2 only 25. Which is the most likely product of the following E2 reaction? CH, CH3

Explanation / Answer

For the first one lets say that cyclohexene is A and Bromine is B you have a reaction like

A + B ==== C

the rate of reaction model is = K * Am * Bn, you want to know what are the values of m and n so

lets think just about A, the statement says that if A is double the rate of reaction is double so, this means that m for A is necessarily 1 , lets imagine this

r = K A, if you double A you will have

K*2A = 2 r, so this makes sense with the statement

for the secon part

statement says that if B is doubled then the rate of reaction quadruples, the value of n must be necessarily 2, this is because 22 = 4, the rate of reaction is like

r = K B2, if you have 2B then

2B2 = 4 B2, then

4r = k 4B2

so the rate of reaction relationship is like

r = K * A1 * B2

the overall kinetic order is n + m , for our particular case this is 1 + 2 = 3 , the reaction is said to be a third overall order

24. Sn1 and E1 reaction has 2 energy transtion states on the energy diagram

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