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  4. Which one of the following compounds does not dissolve in conc. H2SO4 even on warming?

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Q. Which one of the following compounds does not dissolve in conc. $ H_{2}SO_{4} $ even on warming?

Haryana PMTHaryana PMT 2005

Solution:

Hexane does not dissolve in concentrated $H _{2} SO _{4}$.
Hexane is nonpolar hydrocarbon. Polar compound such as benzene, ethylene and aniline dissolve in concentrated $H _{2} SO _{4}$ as they donate their $\pi$ electrons to $H ^{+}$ions of concentrated $H _{2} SO _{4}$.