$A$ major component of Borsch reagent is obtained by reacting hydrazine hydrate with which of the following?

The product $(A)$ of the reaction is:

The chemicals used for preparing acetophenone via Friedel-Crafts acylation are:
$(A)$ $C_6H_6$
$(B)$ $CH_3COCH_3$
$(C)$ $CH_3COCl$
$(D)$ Anhydrous $AlCl_3$

Identify the major product of the following reaction: $C_6H_5-NO_2 + CH_3-COCl \xrightarrow{AlCl_3} \text{Major product}$

The compound used as an explosive is

Chlorination of toluene in the presence of ferric chloride gives........