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Acetylene (C2H2) contains acidic hydrogen atoms and reacts with sodium amide (NaNH2) to produce its sodium salt. Which of the following represents the correct reaction?

1. C2H2 + NaNH2 → C2HNa + NH3
2. C2H2 + NaNH2 → C2H3 + NH3
3. C2H2 + NaNH2 → C2HNa + H2
4. C2H2 + NaNH2 → C2H3 + H2

Correct answer: C2H2 + NaNH2 → C2HNa + NH3

Solution

Acetylene (C2H2) has acidic hydrogen atoms due to the sp-hybridized carbon atoms. It reacts with NaNH2 to form the sodium salt (HC≡CNa) and ammonia (NH3).

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