$P_4S_3$ Structure and Bonding

The compound $P_4S_3$ is a phosphorus sulfide. This question requires identifying the number of phosphorus-sulfur (P-S) and phosphorus-phosphorus (P-P) bonds in its molecule.

Analyzing $P_4S_3$ Structure

The molecular structure of $P_4S_3$ features a specific arrangement of 4 phosphorus atoms and 3 sulfur atoms. A common representation involves:

• A core structure with 3 P-P bonds, typically visualized as a $P_3$ triangle.
• The fourth phosphorus atom (P4) is incorporated into the framework.
• Three sulfur atoms acting as bridges between phosphorus atoms.

Calculating P-S Bonds

Each of the 3 sulfur atoms bridges two phosphorus atoms (P-S-P linkage). This results in 2 P-S bonds per bridging sulfur atom.

Total P-S bonds = Number of sulfur atoms $\times$ 2 bridges/atom

Total P-S bonds = $3 \times 2 = 6$.

Calculating P-P Bonds

The number of P-P bonds is determined by the arrangement of phosphorus atoms. In $P_4S_3$, the count of 3 P-P bonds corresponds to the fundamental framework structure.

Thus, there are 3 P-P bonds.

Final Bond Count for $P_4S_3$

Combining the counts derived from the structure:

• P-S Bonds: 6
• P-P Bonds: 3

This matches Option A.