Question

The following mechanism has been proposed for the gas-phase reaction of chloroform (CHCl₃) and chlorine.

Cl₂ ⇌ 2Cl (fast, reversible)
Cl + CHCl₃ → HCl + CCl₃ (slow)
Cl + CCl₃ → CCl₄ (fast)

What rate law does this mechanism predict? (Choose from the list below and enter your answers in alphabetical order, e.g. ABC ).

A)k	G) [CHCl3]1/2	M) [CCl3]2
B) [Cl2]	H) [CCl3]1/2	N) [HCl]2
C) [Cl]	I) [HCl]1/2	O) [Cl2]2
D) [CHCl3]	J) [Cl2]1/2	P) [Cl]2
E) [CCl3]	K) [Cl]1/2
F) [HCl]	L) [CHCl3]2

Decide which of the following reactive intermediates could exist for the reaction above. (true of false)
Cl₂
Cl
CCl₃
CHCl₃
CCl₄

Answer 1

Catalyst : it is consumed in by a step and regenerated by a later step

Intermediate: It is generated in a step and consumed by a later step.

Both are not present in overall reaction