: RCO < sub > 2 </ sub > H + H < sub > 2 </ sub > C = C = O → RCO < sub > 2 </ sub > C ( O ) CH < sub > 3 </ sub >
: RCO < sub > 2 </ sub > H + H < sub > 2 </ sub > O < sub > 2 </ sub > RCO < sub > 3 </ sub > H + H < sub > 2 </ sub > O
0.004 seconds.