Reduction of alkyl nitrites yields

The major product in the following reaction is:

In the following chemical reaction,
$CH_3CH_2NH_2 + CHCl_3 + 3KOH \rightarrow (a) + (b) + 3H_2O$
What are the products $(a)$ and $(b)$ respectively?

In the below given synthetic sequence,the product "$C$" is

Aniline reacts with which of the following to form a Schiff base?

Which of the following does not undergo a Friedel-Crafts reaction?