hat is the rate determining step in the mechanism of: Step 1: CH3COCH3 (aq) + H+ (aq) -----> CH3COHCH3+ (aq), Step 2: CH3COHCH3+ (aq) --> CH3COHCH2 (aq) + H+ (aq), Step 3 : CH3COHCH2 (aq) + I2 (aq) ---> CH3COCH2I (aq) + H+ (aq) + I- (aq)

The rate-determining step in this mechanism is Step 1: CH3COCH3 (aq) + H+ (aq) → CH3COHCH3+ (aq). This is because it is the slowest step in the overall reaction and determines the overall rate of the reaction.