Solution:

Terminal alkynes are slightly acidic, forms salt with very strong base like Na, $NaNH_2$ etc.
$\, \, \, \, \, H-C\equiv C-H+Na \xrightarrow{\, \, \Delta \, \, \, } H- C \equiv C^- Na^+ + \frac{1}{2}H^2 \uparrow$

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