Q41 / 120 · NEET 2012 (Mains) · Chemistry
Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?
- Correct answerA$\mathrm{NaNH}_2$
- B$\mathrm{HCl}$
- C$\mathrm{O}_2$
- D$\mathrm{Br}_2$
Solution
$\mathrm{NaNH}_2$ is used to distinguish between 1-butyne and 2-butyne.
$$
\begin{aligned}
&\begin{array}{r}
\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CH} \stackrel{\mathrm{NaNH}_2}{\longrightarrow} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CNa} \\
+\frac{1}{2} \mathrm{H}_2 \uparrow
\end{array}\\
&\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_3 \stackrel{\mathrm{NaNH}_2}{\longrightarrow} \text { No reaction }
\end{aligned}
$$
Hence, the correct answer is option: 'A'.