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Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?

1. NaNH2
2. HCl
3. O2
4. Br2

Correct answer: NaNH2

Solution

NaNH2 reacts with terminal alkynes like 1-butyne to form an acetylide ion, but it does not react with internal alkynes like 2-butyne.

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