CBSE  /  Class 12  /  Chemistry  /  Alcohols, Phenols and Ethers

  • 1. 
    Which of the following alcohols gives 2-butenc on dehydration byconc. HSO?

  • 2-methyl propene-2-ol
  • 2-methyl 1 -propanol
  • Butane-2-ol
  • Butane 1-ol

  • 2. 
    One mole of ethyl acetate on tatment with an excess of LiAlH

  • 1 mole acetic acid + 1 mole ethyl alcohol
  • 1 mole ethyl alcohol + 1 mole methyl alcohol
  • 2 moles of ethyl alcohol
  • 1 mole of 2-butanol

  • 3. 
    Which of the following reagents can not, be used to oxidise primary alcohols to aldehydes?

  • CrO
  • KMnO
  • Pyridinium chlorochromate
  • Heat in the presence of Cu at 573 K

  • 4. 
    1-Phenylethanol can be prepared by the reaction of benzaldehyde with

  • methyl bromide
  • ethyl iodide and magnesium
  • methyl iodide and magnesium (Grignard reagent’s)
  • methyl bromide and aluminium bromide

  • 5. 
    Which of the following alcohols will give the most stable carbocation during dehydration?

  • 2-methyl-1-propanol
  • 2-methyl-2-propanol
  • 1-Butanol
  • 2-Butanol

  • 6. 
    Order of esterification of alcohols are

  • 3° > 1° > 2°
  • 2°> 3° > 1°
  • 1 ° > 2° > 3°
  • None of these

  • 7. 
    What happens when tertiary butyl alcohol is passed over heated copper at 300°C?

  • Secondary butyl alcohol is formed
  • 2-methylpropene is formed
  • 1-butene is formed
  • Butanol is formed

  • 8. 
    What would be the reactant and reagent used to obtain 2, 4-dimenthyl pentan-3-ol?

  • Propanal and propyl magnesium bromide
  • 3-methylbutanal and 2-methyl magnesium iodide
  • 2-dimethylpropanone and methyl magnesium odide
  • 2-methylpropanal and isopropyl magnesium iodide

  • 9. 
    The decreasing order of boiling point of the following alcohols is

  • 3-methylbuan-2-ol > 2-methylbutan-2-ol > pentan-1-ol
  • Pentan-1-ol > 3-methylbutan-2-ol > 2-methylbutan-2-ol
  • 2-methylbutan-2-ol > 3-methylbutan-2-ol > pentan-1-ol
  • 2-methylbutan-2-ol > pental-1-ol > 3-methylbutan-2-ol

  • 10. 
    Acid catalysed dehydration of t-butanol is faster than that of n-butanol because

  • tertiary carbocation is more stable than primary carbocation
  • primary carbocation is more stable than tertiary carbocation
  • t-butanol has a higher boiling point
  • rearrangement takes place during dehydration of t- butanol
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