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Alcohols, Phenols, and Ethers — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryAlcohols, Phenols, and Ethers1 Mark
MCQ
Which among the following reactions does not give methyl alcohol?
  • ✓
    The reaction of ethylene with $\mathrm{H}_2 \mathrm{SO}_4$ at $80^{\circ} \mathrm{C}$
  • B
    The reaction of water gas with hydrogen at high temperature
  • C
    Alkaline hydrolysis of methyl bromide
  • D
    Both $a$ and $b$
✓

Answer

Correct option: A.
The reaction of ethylene with $\mathrm{H}_2 \mathrm{SO}_4$ at $80^{\circ} \mathrm{C}$
The reaction of ethylene with $\mathrm{H}_2 \mathrm{SO}_4$ at $80^{\circ} \mathrm{C}$ gives ethyl hydrogensulphate.
$\mathrm{CH}_2=\mathrm{CH}_2+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OSO}_2 \mathrm{OH}$
Water gas (carbon monoxide and hydrogen) at high temperature gives methanol.
$\mathrm{CO}+2 \mathrm{H}_2 \rightarrow \mathrm{CH}_3 \mathrm{OH}$.
Alkaline hydrolysis of methyl bromide gives methanol
$\mathrm{CH}_3 \mathrm{Br}+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{CH}_3 \mathrm{OH}+\mathrm{HBr}$.
 

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