The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are :

A water sample has ppm level concentration of following anions
F^- = 10; $$SO_4^{2-}$$ = 100; $$NO_3^-$$ = 50
The anion/anions that make/makes the water sample unsuitable for drinking is/are :

Which of the following molecules is least resonance stabilized?

Which of the following compounds will form significant amount of meta product during mono-nitration reaction?