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

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 $(x + y)$.

Give a brief note on the acidic nature of alkynes.

What is the product formed when $4$-octyne reacts with $H_2$ in the presence of $Pd/CaCO_3$?

The number of possible structural alkynes with molecular formula $C_5H_8$ is

Provide the primary information about alkynes.