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

  • 1. 
    An unknown alcohol is treated with “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism?

  • Tertiary alcohol by S
  • Secondary alcohol by S
  • Tertiary alcohol by S
  • Secondary alcohol by S

  • 2. 
    An alcohol X when treated with hot cone. HSO gave an alkene Y with formula CH. This alkene on ozonolysis gives single product with molecular formula CHO. The alcohol is

  • butan-1-ol,
  • butan-2-ol
  • 2-methylpropan-1-ol
  • 2,2-dimethylbutynal-1-oI

  • 3. 
    Propanone on reaction with alkyl magnesium bromide followed by hydrolysis will produce

  • primary alcohol
  • secondary alcohol
  • tertiary alcohol
  • carboxylic acid

  • 4. 
    Vapours of an alcohol X when passed over hot reduced copper, produce an alkene, the alcohol is

  • primary alcohol
  • secondary alcohol
  • tertiary alcohol
  • dihydric alcohol

  • 5. 
    Phenol when treated with excess of bromine water gives a white precipitate of

  • 2, 4, 6-tribromophenol
  • o-bromophenol
  • p-bromophenol
  • bromobenzene

  • 6. 
    Picricacid is a yellow coloured compound. Its chemical name is

  • m-nitrobenzoic acid
  • 2, 4, 6-trinitropheriol
  • 2, 4, 6-tribromophenol
  • p-nitrophenol

  • 7. 
    Ortho-nitrophenol is less soluble in water than, p- and m- nitrophenols because

  • o-nitrophenol shows intramolecular H-bonding
  • o-nitrophenol shows intermolecular H-bonding
  • melting point of o-nitrophenol is lower than those of m- and p-isomers
  • o-nitrophenol is more volatile in steam than those of m- and p-isomers

  • 8. 
    The best reagent to convert pent-3-en-2-ol into pent-3-en- 2-one is

  • acidic permanganate
  • acidic dichromate
  • chromic anhydride in glacial acetic acid
  • pyridiriium chlorochromate

  • 9. 
    Identify the final product of the reaction sequence.

  • Benzophenone
  • Acetophenone
  • Diphenyl
  • Methyl salicylate

  • 10. 
    The reaction between phenol and chloroform in the presence of aqueous NaOH is

  • nucleophilic substitution reaction
  • electrophilic addition reaction
  • electrophilic substitution reaction
  • nucleophilic addition reaction
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