TBR Gen Chem Chapter 9 Question#12

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IamAsian

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The question asks:
If the reaction of X with Y is monitored by visible spectroscopy, then which of the following graphs is expected for the absorbance of light by Reactant X as a function of time? The graphs are labeled with t1, t2 and t3, which represent the elapsed time for the reaction, where t3 > t2 > t1.

I thought since reaction X obeys the zero-order, it should be A but the answer states: "Whether we monitor Reactant X or Reactant Y,the reaction obeys second-order kinetics."


Can anyone explain why this is the case? thx
 
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