Question

Which of the following compounds does not dissolve in cone. $H_2S O_4$ even on warming?

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

Answer 1

Answer: (C)

Hexane

Answer 2

The correct answer is C:Hexane
Ethylene absorb $H_2S O_4$ forming $CH_3-CH_2 OSO_3 H$ and dissolve. Benzene, with warm $H_2S O_4,$ undergo sulphonation
and dissolve. Aniline, with $H_2S O_4,$ forms anilinium sulphate salt and dissolve. Hexane, a hydrophobic molecule, does not react with $H_2S O_4,$
remains insoluble.