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Alcohols Phenols and Ethers question

2022 · 29 Jul · Shift 2 · Q12
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Alcohols Phenols and Ethers question

2022 · 29 Jul · Shift 2 · Q12

JEE MainChemistryAlcohols Phenols and EthersMCQ+4 / −1
When ethanol is heated with conc. H2SO4\mathrm{H}_{2} \mathrm{SO}_{4}H2​SO4​, a gas is produced. The compound formed, when this gas is treated with cold dilute aqueous solution of Baeyer's reagent, is
  1. A
    formaldehyde
  2. B
    formic acid
  3. C
    glycol
  4. D
    ethanoic acid
View written solutionFree

Correct answer: C

  1. Identify the gas produced from ethanol with conc. H2SO4\mathrm{H_2SO_4}H2​SO4​

    When ethanol is heated with concentrated sulfuric acid, it undergoes dehydration to form ethene gas:

    C2H5OH→heatconc. H2SO4CH2=CH2+H2O\mathrm{C_2H_5OH \xrightarrow[heat]{conc.\ H_2SO_4} CH_2=CH_2 + H_2O}C2​H5​OHconc. H2​SO4​heat​CH2​=CH2​+H2​O

    So, the gas produced is ethene.

  2. Action of Baeyer's reagent on ethene

    Baeyer's reagent is cold dilute alkaline KMnO4\mathrm{KMnO_4}KMnO4​. It oxidizes alkenes to vicinal diols (glycols).

    Ethene reacts as:

    CH2=CH2→cold,dil.KMnO4/OH−HO−CH2−CH2−OH\mathrm{CH_2=CH_2 \xrightarrow[cold,dil.]{KMnO_4/OH^-} HO-CH_2-CH_2-OH}CH2​=CH2​KMnO4​/OH−cold,dil.​HO−CH2​−CH2​−OH

    The product formed is ethylene glycol (a glycol).

  3. Match with the given options

    • A: formaldehyde →\rightarrow→ incorrect
    • B: formic acid →\rightarrow→ incorrect
    • C: glycol →\rightarrow→ correct
    • D: ethanoic acid →\rightarrow→ incorrect

  4. Final answer

    The compound formed is glycol.

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