$CH_3-C \equiv CH$ $\xrightarrow{Na} X$ $\xrightarrow{CH_3-Cl} Y$,$Y$ is

Number of acidic hydrogen atoms in $but-1-yne$ are

$But-1-yne$ and $But-2-yne$ can be distinguished by

Choose the correct set of reagents for the following conversion:
$trans-(Ph-CH=CH-CH_3) \rightarrow cis-(Ph-CH=CH-CH_3)$

The structure of the product $(Z)$ in the reactions given below is:
$HC \equiv CH$ $\xrightarrow{NaNH_2, CH_3COCH_3, H^{+}} X$ $\xrightarrow{Hg^{2+}, H_3O^{+}, H_2O} Z$

Explain the acidic nature of ethyne.