$R-CH_2-CCl_2-R \xrightarrow{\text{Reagent}} R-C \equiv C-R$
The reagent is

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

An inorganic metal oxide $(A)$ heated with carbon gives compound $(B)$,which on reaction with water gives ethyne. What are the compounds $(A)$ and $(B)$?

Formation of ethylene from acetylene is an example of

Which of the following metal carbides gives propyne on hydrolysis?

Identify the structures of $P$ and $Q$ in the following reaction sequence: