Let's examine each match:
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(A) A: For complex reactions order is determined by matches with R: Slowest rate determining step.
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(B) B: For zero order reaction unit of k is same as that of matches with S: Rate law.
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(C) C: Mathematical expression which gives relationship matches with D: For a first order reaction plot of log \([R_0]/[R]\) vs time gives.
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(D) D: For a first order reaction plot of log \([R_0]/[R]\) vs time gives matches with Q: Slope = k/2.303.
Thus, the correct match is:
\[
A = R, B = S, C = D, D = Q
\]