Chemistry

Problem

The gas-phase reaction

2\text{A} + \text{B} \rightarrow \text{C}

has an experimentally determined rate law of

\text{rate}=k[\text{A}][\text{B}]

. A chemist proposes that the reaction occurs in a single elementary step:

2\text{A} + \text{B} \rightarrow \text{C}

. Explain in one to two sentences why this proposed elementary step is unlikely to be correct.