The reaction of $1,2$-dibromoethane with alcoholic potash yields.......

What is the final product,$C$ of the following reaction sequence?
$CH_3CH_2-C \equiv CH$ $\xrightarrow[2. CH_3CH_2Br]{1. NaNH_2} A$ $\xrightarrow{Na, NH_3(liq.)} B$ $\xrightarrow{Br_2, CH_2Cl_2} C$

Which of the following will undergo a reaction with ammoniacal $AgNO_3$?

$A$ metallic carbide on treatment with water gives a colourless gas which burns readily in air and which gives a precipitate with ammoniacal silver nitrate solution. The gas evolved is:

When $23 \ g$ of $Na$ reacts with $1 \ mole$ of propyne,how many moles of $H_2$ gas will be released?

The product obtained in this reaction is: