Question

Which of the following compounds does not dissolve in conc. H₂SO₄ even on warming? (a) ethylene (b) benzene(c) hexane (d) aniline

Answer 1

yes it is hexane. .all others have some polarity(some place for acid to attack) with con.H2SO4 1.ethene yields ethanol 2.aniline yields sulfate,eventually sulfanillic acid 3.benzene yields sulfonic acid

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Answer 2

Hey Dear,

◆ Answer -

(c) hexane

● Explaination -

• Conc. H₂SO₄ is strong acid used as sulphonating & dehydrating agent.
• Presence of some residual polarity is a prerequisite for conc. H₂SO₄ to act.
• As hexane molecule doesn't show polarity, conc. H₂SO₄ doesnt react with it even after warming.

Other options get sulphonated by action of conc. H₂SO₄,

1. ethylene => ethyl hydrogen sulphate
2. benzene => benzene sulphonic acid
3. aniline => sulphanilic acid

Hope this helped you.