If acetylene is passed through an electric arc in the atmosphere of nitrogen,the compound formed is

What is the major organic product of the following reaction?
$Ph-C \equiv CH \xrightarrow[H_2SO_4]{Hg^{2+}, H_2O} ?$

$Ph-CCl_2-CH_3 \xrightarrow{3NaNH_2} \text{Product } (A)$; Product $(A)$ is

The reagent which is used to distinguish between propene and propyne is

The major product $(A)$ is:

The following reaction is an example of a ....... reaction: $CH_2Br-CH_2Br + 2KOH (alc.) \xrightarrow{\Delta} CH \equiv CH + 2KBr + 2H_2O$