$$ \stackrel{\bullet}{\mathrm{Cl}}+\mathrm{CH}_{4} \rightarrow \mathrm{A}+\mathrm{B} $$

A and B in the above atmospheric reaction step are :

Which technique among the following, is most appropriate in separation of a mixture of $$100 \,\mathrm{mg}$$ of $$p$$-nitrophenol and picric acid ?

The difference in the reaction of phenol with bromine in chloroform and bromine in water medium is due to :

Which of the following compounds is not aromatic?