Question

Which one of the following compounds does not dissolve in conc. $H_{2}S{O}_4$ even on warming?

• A. Ethylene
• B. Benzene
• C. Hexane
• D. Aniline

Answer 1

Answer: (C)

Hexane does not dissolve in concentrated $H_{2}S{O}_4$.
Hexane is nonpolar hydrocarbon. Polar compound such as benzene, ethylene and aniline dissolve in concentrated $H_{2}S{O}_4$ as they donate their $\pi$ electrons to $H^{+}$ions of concentrated $H_{2}S{O}_4$.