Question:
Which of the following has no reaction with $NaNH_2$?
Which of the following has no reaction with $NaNH_2$?
Show Hint
Only terminal alkynes are acidic; internal alkynes do not react with sodamide.
Updated On: Jun 6, 2026
- Ethyne
- Propyne
- But-2-yne
- But-1-yne
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Terminal alkynes have acidic hydrogen, which reacts with strong bases like $NaNH_2$.
Step 2: Meaning
$NaNH_2$ (sodamide) reacts with terminal alkynes ($R-C \equiv C-H$) but not with internal alkynes ($R-C \equiv C-R$).
Step 3: Analysis
Ethyne, Propyne, and But-1-yne are terminal alkynes (have acidic H). But-2-yne is an internal alkyne (no acidic H).
Step 4: Conclusion
But-2-yne has no reaction with $NaNH_2$.
Final Answer: (C)
Terminal alkynes have acidic hydrogen, which reacts with strong bases like $NaNH_2$.
Step 2: Meaning
$NaNH_2$ (sodamide) reacts with terminal alkynes ($R-C \equiv C-H$) but not with internal alkynes ($R-C \equiv C-R$).
Step 3: Analysis
Ethyne, Propyne, and But-1-yne are terminal alkynes (have acidic H). But-2-yne is an internal alkyne (no acidic H).
Step 4: Conclusion
But-2-yne has no reaction with $NaNH_2$.
Final Answer: (C)
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