The number of incorrect statement/s from the following is ________
A. The successive half lives of zero order reactions decreases with time.
B. A substance appearing as reactant in the chemical equation may not affect the rate of reaction
C. Order and molecularity of a chemical reaction can be a fractional number
D. The rate constant units of zero and second order reaction are mol ${\mathrm{L}}^{-1}{\mathrm{s}}^{-1}$ and ${\mathrm{mol}}^{-1}\mathrm{L}{\mathrm{s}}^{-1}$ respectively.