For the reaction
\(\text{H}_2(g) + \text{Br}_2(g) \to 2 \text{HBr}(g)\),
the experimental data suggest the rate law
\(\text{Rate} = k[\text{H}_2][\text{Br}_2]^{1/2}\).
The molecularity and order of the reaction are respectively
Following are the four molecules ``P``, ``Q``, ``R`` and ``S``. Which one among the four molecules will react with H-Br(aq) at the fastest rate? Molecules:

\[ P: \text{Cyclic compound with two O groups attached to the ring.} \] \[ Q: \text{Cyclic compound with one O group and one CH\(_3\) group attached to the ring.} \] \[ R: \text{Cyclic compound with one O group attached to the ring and one CH\(_3\) group attached to the ring.} \] \[ S: \text{Cyclic compound with one CH\(_3\) group attached to the ring.} \]