Which of the following compounds reacts with chloroform and a base to form phenyl isocyanide?

Which of the following is most basic?

Identify the major product formed in the following sequence of reactions:
Aniline $\xrightarrow{Br_2/H_2O}$ $2,4,6-$Tribromoaniline $\xrightarrow{NaNO_2/HCl}$ $2,4,6-$Tribromobenzenediazonium chloride $\xrightarrow{H_3PO_2/H_2O}$ Product.

If an organic compound is treated with $NaNO_2$ and $HCl$ in the presence of ice and nitrogen gas is evolved,what is the compound?

Identify the final product $Z$ in the following reaction sequence:

Which one of the following compounds undergoes bromination of its aromatic ring (electrophilic aromatic substitution) at the fastest rate?