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  4. Which of the following compounds liberates hydrogen gas on reacting with sodium metal?

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Q. Which of the following compounds liberates hydrogen gas on reacting with sodium metal?

EAMCETEAMCET 1999

Solution:

Na has basic characteristics so, it reacts with acidic compounds. In the given compounds $ {{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}} $ has acidic nature because H attached with triple bonded carbon has acidic Character so, sodium reacts with acetylene to evolve $ {{\text{H}}_{2}} $ gas. $ \underset{CH}{\overset{CH}{\mathop{|||}}}\,+2Na\xrightarrow{{}}\underset{\text{Sodium}\,\text{acetylide}}{\mathop{\underset{C.Na}{\overset{C.Na}{\mathop{|||}}}\,}}\,+{{H}_{2}} $