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

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?
  1. $\mathrm{NaNH}_2$
  2. $\mathrm{HCl}$
  3. $\mathrm{O}_2$
  4. $\mathrm{Br}_2$

Solution

$\mathrm{NaNH}_2$ is used to distinguish between 1-butyne and 2-butyne. $\begin{aligned} &\begin{array}{r} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CH} \stackrel{\mathrm{NaNH}_2}{\longrightarrow} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CNa} \\ +\frac{1}{2} \mathrm{H}_2 \uparrow \end{array}\\ &\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_3 \stackrel{\mathrm{NaNH}_2}{\longrightarrow} \text { No reaction } \end{aligned}$

Asked in: NEET 2012 (Mains)

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