What is the product when $2-$butyne is treated with liquid $NH_3$ in the presence of lithium?

The reaction $Ph-C \equiv CH \xrightarrow[{(2)\,H_2O_2/OH^{-}}]{{(1)\,BH_3.THF}}$ Product; the product is

Predict the product of the following reaction sequence:
$HC \equiv CH$ $\xrightarrow[\begin{smallmatrix} (2) \text{ excess } I-CH_2-(CH_2)_2-CH_3 \\ (3) \text{ } H^{\oplus} \end{smallmatrix}]{(1) \text{ excess } NaNH_2}$

Which reagent is used to distinguish between propene and propyne?

Which of the following compounds reacts with $[Ag(NH_3)_2]^+$ and gives $(CH_3)_3C-COOH$ upon oxidation with alkaline $KMnO_4$?

Give the main product of the following reactions:
$(i)$ $1,1,2,2-$tetrabromopropane + zinc powder in methanol.
$(ii)$ Reaction occurring on passing hydrogen gas through carbon electrodes at high temperature in an electric arc.