Which chemical reaction is flawed? (ANSWER QUICKLY!!!!!!)
A. 2NI3 --->N2 + 3I2
B. 2H2 + O2 ---> 2H2O
C. CaCO3 + 2HCl ----> CaCl2 + H2O
D. 2AlBr3 + 3Cl2 ---> 2AlCl3 + 3Br2