AMINES: Why in case of alkyl amines reaction with NaNO2 HCl gives - OH instead of NH2 but in case of aryl amines we get N2+Cl-?

Q. Which of the following amines will give primary alcohol with $NaN{O}_2/Conc.HCl:$

$\left(a\right)C{H}_3-C{H}_2-\underset{C{H}_3}{\underset{|}{C}}-N{H}_2$

$\left(b\right)C{H}_3-\underset{C{H}_3}{\underset{|}{\stackrel{C{H}_3}{\stackrel{|}{C}}}}-N{H}_2$

$\left(c\right)C{H}_3-\underset{C{H}_3}{\underset{|}{C}}-C{H}_2-C{H}_2-N{H}_2$
$\left(d\right)Allofthese$

Q. Assertion :Gabriel phthalimide rection can be used to prepare aryl amines Reason: Aryl halides have same reactivity as alkyl halids towards nucleophilic substitution reactions.

Q. Which of the following alkene cannot be prepared by de-amination of $\underset{(n-Butyl)}{n-Bu-N{H}_2}$ with $NaN{O}_2/HCl$?

Q. Primary amines on heating with $CH{Cl}_3,KOH$ and $NaOH$ form alkyl isocyanides. This reaction is called:

Q. When alkyl/benzyl halide gets converted into amines in the presence of ammonia in ethanol, the reaction is known as: