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STD 12 - 7. Alcohol, phenol and ethers — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 7. Alcohol, phenol and ethers4 Marks
MCQ
Ether is formed when ethyl alcohol is heated with conc. ${H_2}S{O_4}.$ The conditions are
  • A
    Excess of ${H_2}S{O_4}$ and ${170\,^o}C$
  • ✓
    Excess of ${C_2}{H_5}OH$ and ${140\,^o}C$
  • C
    Excess of ${C_2}{H_5}OH$ and ${180\,^o}C$
  • D
    Excess of conc. ${H_2}S{O_4}$ and ${100\,^o}C$
✓

Answer

Correct option: B.
Excess of ${C_2}{H_5}OH$ and ${140\,^o}C$
b
When excess ethanol is heated with sulphuric acid at temperature $413\,K$ $\left(140^{\circ}\,C \right)$ we get Diethyl ether.But when excess Sulphuric acid is used at $443\,K \left(170^{\circ}\,C \right)$, it behaves like a dehydrating agent and we get Ethene.

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