The major organic compound formed by the reaction of $1, 1, 1-$trichloroethane with silver powder is:

Silver acetylide when heated with $HCl$ gives:

Explain: 'Hydrogen attached to a carbon having a triple bond is acidic in nature.' Also,write an appropriate reaction for it.

When $Mg_2C_3$ is reacted with water,a compound $X$ is formed which on heating with $Na$ followed by treatment with $C_2H_5Br$ gives another compound $Y$. Calculate the number of sigma bonds in $Y$.

$2-$pentyne on reaction with sodium in liquid ammonia produces compound $A$. What is $A$?

Describe the physical properties of alkynes.