$CH_3-CH_2-C \equiv CH \xrightarrow{R, H_2O} \text{Butanone}$. $R$ is:

In the reaction $HC \equiv CH + 2AgNO_3 \xrightarrow{NH_4OH} X + 2NH_4NO_3 + 2H_2O$,'$X$' is:

An unknown compound $A$ has a molecular formula $C_4H_6$. When $A$ is treated with an excess of $Br_2$,a new substance $B$ with formula $C_4H_6Br_4$ is formed. $A$ forms a white precipitate with ammoniacal silver nitrate solution. $A$ may be

$2-$Hexyne gives $trans-2-$hexene on treatment with:

The correct order of acidity of the following compounds is

$I. CH_3-C \equiv CH$

$II. F_3C-C \equiv CH$

$III. CH_3-C \equiv C-CH_3$

$IV. CH_3-CH=CH-CH_3$

When $1,2-$dibromopropane is treated with $X$ moles of $NaNH_2$,the resulting compound reacts with ethyl bromide to form pentyne. What is the value of $X$?