Phenol with Hinsberg’s reagent gives

In the above first order reaction the initial concentration of $\mathrm{N}_{2} \mathrm{O}_{5}$ is $2.40 \times 10^{-2}\, \mathrm{~mol} \,\mathrm{~L}^{-1}$ at $318 \,K.$ The concentration of $\mathrm{N}_{2} \mathrm{O}_{5}$ after $1\, hour$ was $1.60 \times 10^{-2}\, \mathrm{~mol} \,\mathrm{~L}^{-1}$, The rate constant of the reaction at $318\, \mathrm{~K}$ is $.....\,\times 10^{-3} \mathrm{~min}^{-1}$. (Nearest integer)

[Given: $\log 3=0.477, \log 5=0.699$ ]

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The correct order of melting point of dichlorobenzenes is

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$p- $Nitrobromobenzene can be converted to $p-$nitroaniline by using $NaN{H_2}$. The reaction proceeds through the intermediate named

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Addition of $HCl$ to vinyl chloride gives $1, 1-$dichloroethane because of

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Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in $grams$) of the salt required to achieve $10 \;ppm$ of iron in $100 \;\mathrm{kg}$ of wheat is

Atomic weight : $Fe =55.85 ; \mathrm{S}=32.0$ $\mathrm{O}=16.00$

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Larger number of oxidation states are exhibited by the actinoides than those by the lanthanoids, the main reason being