Fluorination of an aromatic ring is easily accomplished by treating a diazonium salt with $HBF_4$. Which of the following conditions is correct about this reaction?

Acetic acid on heating with $NH_3$ forms $A$. When $A$ reacts with $LiAlH_4$ followed by hydrolysis,it gives $B$. When $B$ is heated with chloroform in $KOH$ medium,it gives $C$. What are $B$ and $C$ respectively?

Which of the following will be the most stable diazonium salt $(R-N_2{^+} X^{-})$?

What is the correct order of basic strength in substituted amines in an aqueous solution?

Which of the following is the strongest Bronsted base?

Identify the product $Z$ in the following reaction:
$C_6H_5NH_2$ $\xrightarrow{(Ac)_2O} X$ $\xrightarrow{Br_2/CCl_4} Y$ $\xrightarrow{HOH} Z$