Question

Ethene and ethyne are distinguished by

• A. Baeyer's reagent
• B. Tollen's reagent
• C. Hager's reagent
• D. None of these

Answer 1

Answer: (B)

Ethyne gives white precipitate of silver acetylide on reaction with Tollen's reagent but ethene does not react with Tollen's reagent. $\underset{ethyne}{\underset{CH}{\stackrel{CH}{|||}}}+\underset{\begin{array}{c}Tolle{n}^{\prime }s\\ reagent\end{array}}{A{g}_{2}O}\to \underset{whiteppt.}{\underset{CAg}{\stackrel{CAg}{|||}}}+H_{2}O$ $\underset{C{H}_2}{\stackrel{C{H}_2}{|||}}+A{g}_{2}O\to Noreaction$