Which of the following bonds makes a hydrocarbon most reactive?

By heating a mixture of $CHCl_3$ with silver powder,the compound formed is

Acetylene gives which of the following reactions?

What are $X$ and $Y$ respectively in the following reaction?
$Z$-product $\stackrel{Y}{\longleftarrow} 2$-butyne $\stackrel{X}{\longrightarrow} E$-product

Ethene can be separated from acetylene by passing the mixture through :

The molecular formula of the first member of the family of alkenynes and its name is given by the set: