In a set of reactions nitrobenzene gave a product $$C$$. Identify the product $$C$$.
$$\mathrm{C}_6 \mathrm{H}_5 \mathrm{NO}_2 \xrightarrow{\mathrm{Fe} / \mathrm{HCl}} A \xrightarrow[273 \mathrm{~K}]{\mathrm{NaNO}_2 / \mathrm{HCl}} B \xrightarrow[\Delta]{\mathrm{H}_2 \mathrm{O} / \mathrm{H}^{+}} C$$
Which one of the following compounds is formed in the laboratory from benzene by a substitution reaction?
Atomic number of $$\mathrm{Mn}, \mathrm{Fe}$$ and $$\mathrm{Co}$$ are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?
I. $$\left[\mathrm{CO}\left(\mathrm{NH}_3\right)_6\right]^{3+}$$
II. $$\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$$
III. $$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$$
IV. $$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$$
Choose the correct option.
Arrhenius equation may not be represented as