THE EXCHANGE REACTIONS OF CHLORINE AND HYDROGEN BETWEEN BENZAL CHLORIDE AND AQUEOUS CHLORIDE SOLUTION By

The exchange rates of chlorine and hydrogen of benzal chloride were measured by using radioactive 36Cl and 3H at 12°C in aqueous acidic or basic solution. The findings that the rate of the chlorine exchange is neither of the first arder with respect to the chloride ion concentration in solution nor constant independently of the concentration led us to conclude that the chlorine exchange proceeds by the reversal of the rate-determining step of the hydrolysis. The hydrogen exchange was found to be catalyzed by BRONSTED base and slower than the hydrolysis rate. The observed hydrogen exchange was suggested to proceed by the proton transfer between benzal chloride and BRONSTED base which is in equilibrium