Reduction of nitrobenzene in the presence of Zn / NH₄Cl gives

In the reduction of nitrobenzene, which of the following is the intermediate?

The major product (70% to 8%) of the reaction between m-dinitrobenzene with NH₄HS is

Tertiary nitro compounds do not tautomerise because

Attacking species in nitration of benzene in presence of fuming HNO₃ is

Consider the following reaction
What is Y?

In the above sequence, Y can be

Nitrobenzene on further excessive nitration gives

The reagent that reacts with nitromethane to form  methylhydroxylamine is