ORGANIC CHEMISTRY QUIZ 5 (2025)

Which of the reagent can be used to distinguish pentan-1-ol and pentan-2-ol?

• PCl5

• ZnCl2 +

  conc. HCl

• I2 + NaOH

• KMnO4 + H+

Which of the reaction will produce an aldehyde?

• O3 in CH2Cl2 followed by DMS (-57'c)

• Butan-2-ol + Cu (heat at 400'c)

• Pentan-2-ol + PCC (heat)

• 1,1-dichlorobutane + KOH (aq)

What will be formed when 3-methylpentan-1-ol heated with K2Cr2O7 with H+?

• Aldehyde

• Ketone

• Carboxylic acid

• Diol

What is the reagents for elimination reaction of CH3CH(OH)CH3 ?

• Ethanolic KCN

• Ethanolic KOH

• Sayzeff reagent

• Alumina (Al2O3)

  and heat

1-chloropropane + KCN ---------> X + H3O+ --------------> Y

What is Y?

• Propanal

• Propanoic acid

• Butanal

• Butanoic acid

Which of the following reactions is esterification reaction?

• Ethanol +

  Ethanoyl chloride

  (room condition)

• methanol + ethanoyl chloride (conc.H2SO4)

• Methanoic acid +

  Propanoyl chloride

  (Conc. H2SO4)

• Ethanol + Propanoic acid

  (heat under reflux)

What will be formed when CH3CH2CHBr2 react with KOH (ethanolic)

• Diol

• Alkene

• Alkyne

• Aldehyde

Which of the following can used to yield butanoic acid?

• carbon dioxide +

  propyl magnesium chloride

• hot and conc KMnO4 + H+

  +

  pent-2-ene

• butan-2-ol
  +
  H+ + KMnO4 (Heat)

• potassium hydroxide (ethanolic)

  +

  1,1,1-tribromobutane

What is the reagents used to synthesis (C6H5)CH2Cl ?

• CH3Cl

  with AlCl3 catalyst

  + toluene

• Cl2

  with AlCl3 catalyst

  + toluene

• CH3Cl

  with UV light

  + toluene

• Cl2

  with UV light

  + toluene

Which following pairs will produce 3-phenylhexan-3-ol

• C2H5MgCl

  +

  1-phenylbutan-1-one

• C3H7Li

  +

  1-phenylpropan-2-one

• C6H5Li +

  hexan-3-one

• C3H7MgCl

  +

  1-phenylpropan-1-one