Which general equation shows a single-displacement reaction? A. \( A X+B Y \rightarrow A Y+B X \) B. \( A+B X \rightarrow A X+B \) C. \( B X \rightarrow B+X \) D. \( A+Y \rightarrow A Y \)

A single-displacement (or single-replacement) reaction involves one element replacing another in a compound. The general form of such a reaction is: \[ \text{A} + \text{BC} \rightarrow \text{AC} + \text{B} \] Let's analyze the given options: - **Option A:** \( A X + B Y \rightarrow A Y + B X \) - This represents a **double-displacement** reaction, where elements X and Y are swapped between compounds AX and BY. - **Option B:** \( A + B X \rightarrow A X + B \) - This matches the single-displacement format. Here, element A displaces element B from compound B\(X\), forming A\(X\) and releasing B. - **Option C:** \( B X \rightarrow B + X \) - This is a **decomposition** reaction, where compound BX breaks down into elements B and X. - **Option D:** \( A + Y \rightarrow A Y \) - This is a **combination** reaction, where elements A and Y combine to form compound AY. **Therefore, the correct answer is:** **Answer:** **B. \( A+B X \rightarrow A X+B \)**