The number of $\sigma$ and $\pi$ bonds present in $pent-4-en-1-yne$ is

The catalyst required for the dimerization of acetylene to form chloroprene is ....

Which of the following metal carbides gives propyne on hydrolysis?

What will be the product of the reaction $CH_3-C \equiv C-CH_2CH_3 \xrightarrow[(2) \text{ Hydrolysis}]{(1) O_3} \, ?$

In the given reactions,find the sum of $(x + y)$.
$(1)$ $Ph-C(Br)_2-CH_3$ $\xrightarrow{xNaNH_2} (A)$ $\xrightarrow{CH_3I} Ph-C \equiv C-CH_3$
$(2)$ $CH_3-CH_2-C(Br)_2-CH_3 \xrightarrow{yNaNH_2} CH_3-C \equiv C-CH_3$
Find the value of $(x + y)$.

$A$ metallic carbide on treatment with water gives a colourless gas which burns readily in air and which gives a precipitate with ammoniacal silver nitrate solution. The gas evolved is: