Hydrocarbons 1 Question 14
14. Which of the following compounds does not dissolve in conc. $\mathrm{H}{2} \mathrm{SO}{4}$ even on warming?
$(1983,1 \mathrm{M})$
(a) Ethylene
(b) Benzene
(c) Hexane
(d) Aniline
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Solution:
- Ethylene absorb $\mathrm{H}{2} \mathrm{SO}{4}$ forming $\mathrm{CH}{3}-\mathrm{CH}{2} \mathrm{OSO}{3} \mathrm{H}$ and dissolve. Benzene, with warm $\mathrm{H}{2} \mathrm{SO}_{4}$, undergo sulphonation and dissolve.
Aniline, with $\mathrm{H}{2} \mathrm{SO}{4}$, forms anilinium sulphate salt and dissolve. Hexane, a hydrophobic molecule, does not react with $\mathrm{H}{2} \mathrm{SO}{4}$, remains insoluble.
