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Q.
Assertion : Ethyne reacts with sodium metal and sodamide to form sodium acetylide with the liberation of dihydrogen gas.
Reason : Alkynes are highly unsaturated.
Hydrocarbons
Solution:
Hydrogen atoms in ethyne $(HC \equiv CH)$ are attached to the $sp$ hybridised carbon atoms which is more electronegative. Thus, hydrogen atom can be liberated as proton more easily and ethyne behaves as an acid.