Q56. Consider the following reaction
$$\mathrm { A } + \mathrm { B } \rightarrow \mathrm { C }$$
The time taken for A to become $1 / 4 ^ { \text {th } }$ of its initial concentration is twice the time taken to become $1 / 2$ of the same. Also, when the change of concentration of $B$ is plotted against time, the resulting graph gives a straight\\
line with a negative slope and a positive intercept on the concentration axis. The overall order of the reaction is