Question:
The hydrocarbon that forms disodium salt with excess metallic sodium is
The hydrocarbon that forms disodium salt with excess metallic sodium is
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Terminal alkynes (with a -C≡CH group) have acidic hydrogens and can react with strong bases like Na or NaNH\(_2\).
Updated On: Apr 24, 2026
- ethane
- ethene
- ethyne
- propene
- propane
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Acidic hydrogen atoms in a hydrocarbon react with sodium metal to form sodium salts.
Step 2: Detailed Explanation:
Ethyne (acetylene, HC≡CH) has two terminal acidic hydrogen atoms (due to the sp hybridization). It can react with excess sodium metal to form a disodium salt (sodium acetylide, NaC≡CNa). Alkanes and alkenes do not have such acidic hydrogens and do not react with sodium metal.
Step 3: Final Answer:
Ethyne forms a disodium salt with excess metallic sodium.
Acidic hydrogen atoms in a hydrocarbon react with sodium metal to form sodium salts.
Step 2: Detailed Explanation:
Ethyne (acetylene, HC≡CH) has two terminal acidic hydrogen atoms (due to the sp hybridization). It can react with excess sodium metal to form a disodium salt (sodium acetylide, NaC≡CNa). Alkanes and alkenes do not have such acidic hydrogens and do not react with sodium metal.
Step 3: Final Answer:
Ethyne forms a disodium salt with excess metallic sodium.
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