NCERT/Class 12/Chemistry/Aldehydes, Ketones and Carboxylic Acids

Aldehydes, Ketones and Carboxylic Acids

Class 12 · Chemistry

33 questions13 easy11 medium9 hard

Sample Questions

Q1.In nucleophilic addition to carbonyl compounds, which factor makes aldehydes more reactive than ketones?

  • AAldehydes have higher molecular weights
  • BAldehydes have one H and one alkyl group on carbonyl carbon — less steric hindrance and less electron donation
  • CAldehydes have more polar C=O bonds
  • DKetones have stronger van der Waals forces

Q2.What is the IUPAC name of CH3CHO?

  • AMethanal
  • BEthanal
  • CPropanal
  • DAcetaldehyde

Q3.An organic compound A (C8H8O) gives a positive 2,4-DNP test and a positive iodoform test, but does NOT reduce Tollens' reagent. What is compound A?

  • AStyrene (C6H5CH=CH2)
  • BAcetophenone (C6H5COCH3)
  • CBenzaldehyde (C6H5CHO)
  • DPhenylacetaldehyde (C6H5CH2CHO)

Q4.The hell-Volhard-Zelinsky (HVZ) reaction involves:

  • AReaction of carboxylic acids with Br2 in the presence of red phosphorus to give α-bromo acids
  • BReaction of alcohols with HBr
  • CBromination of aromatic rings
  • DDecarboxylation of carboxylic acids

Q5.The reaction of carboxylic acid with excess alcohols in presence of H2SO4 gives:

  • AAcid anhydride
  • BEster (Fischer esterification)
  • CKetone
  • DAcyl halide

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

Acidity of Carboxylic AcidsAldol CondensationCannizzaro ReactionClemmensen and Wolff-Kishner ReductionHaloform ReactionNomenclature of Aldehydes and KetonesNomenclature of Carboxylic AcidsNucleophilic Addition ReactionsOxidation of Aldehydes (Tollens and Fehling Tests)Preparation of Carboxylic AcidsReactions of Carboxylic Acids

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