Count the $\pi$-bonds:
Two $\pi$-bonds in the aromatic ring.
One $\pi$-bond in the carboxyl group.
Two $\pi$-bonds in the nitro group.
\[ \text{Total number of $\pi$-bonds} = 5. \]
Final Answer: \[ 5. \]
For the thermal decomposition of \( N_2O_5(g) \) at constant volume, the following table can be formed, for the reaction mentioned below: \[ 2 N_2O_5(g) \rightarrow 2 N_2O_4(g) + O_2(g) \] Given: Rate constant for the reaction is \( 4.606 \times 10^{-2} \text{ s}^{-1} \).
A hydrocarbon which does not belong to the same homologous series of carbon compounds is