Benzonitrile on reaction with a reagent in dry ether followed by hydrolysis forms benzophenone along with ammonia and hydroxymagnesium bromide. Identify the reagent used in above transformation.

Propyne on reaction with water in presence of $40\%$ sulphuric acid and $1\%$ mercuric sulphate forms

Identify final products in the following sequence of reactions
$\text{RCOOH} + \text{R'OH} \xrightarrow{\large{\text{H}^+}} \text{intermediate} \xrightarrow{\large{\text{Ni}, \Delta}}^{\large{\text{H}_2}} \text{Products}$

Which from following amines does NOT form alkyl isocyanide when heated with alc. KOH and chloroform