Trimethyloxonium tetrafluoroborate reacts with methanol (CH3OH) to give dimethyl ether (CH3OCH3). Which equation, including the curved arrows, best represents the rate-determining step in the mechanism

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.