A sealed container was charged with two moles of compound P. The container was then heated, causing P to decompose partly to give only Q and R. A dynamic equilibrium involving P, Q and R was set up. When equilibrium was reached, $x$ moles of R were present, and the total number of moles present was $\left(2 + \frac{x}{2}\right)$. What equation represents this reversible reaction?
- A$\text{P} \rightleftharpoons 2\text{Q} + \text{R}$
- B$2\text{P} \rightleftharpoons 2\text{Q} + \text{R}$
- C$2\text{P} \rightleftharpoons \text{Q} + \text{R}$
- D$2\text{P} \rightleftharpoons \text{Q} + 2\text{R}$