Quiz for Aldehydes and Ketones

Q1: Which reagent is used for the oxidation of aldehydes to carboxylic acids?

A. Fehling’s solution B. Tollens’ reagent C. LiAlH4 D. NaBH4

Q2: Which of the following compounds gives a positive iodoform test?

A. Methanal B. Ethanol C. Propanone D. Acetaldehyde

Q3: Which functional group is present in aldehydes?

A. -COOH B. -CHO C. -OH D. -CO-

Q4: What is the product of the reaction between ethanal and HCN?

A. Ethanol B. Ethanoic acid C. Hydroxypropanoic acid D. Cyanohydrin

Q5: Which test distinguishes between aldehydes and ketones?

A. Iodoform test B. Benedict’s test C. Lucas test D. Tollens’ test

Q6: Which reagent reduces aldehydes to primary alcohols?

A. PCC B. LiAlH4 C. Tollens’ reagent D. KMnO4

Q7: Which compound is most reactive towards nucleophilic addition?

A. Acetone B. Formaldehyde C. Butanone D. Benzophenone

Q8: What is the product of aldol condensation of acetaldehyde?

A. But-2-enal B. Butan-1-ol C. Ethanol D. Methanol

Q9: Which of the following will not reduce Fehling’s solution?

A. Formaldehyde B. Acetaldehyde C. Acetone D. Glyceraldehyde

Q10: Which reaction involves the use of semicarbazide?

A. Oxidation B. Reduction C. Derivatization of carbonyl group D. Substitution

Q11: Which compound will give a positive Tollens’ test?

A. Propanone B. Benzaldehyde C. 2-butanone D. Cyclohexanone

Q12: Which of the following does not give iodoform test?

A. Ethanol B. Propanone C. Methanol D. Acetaldehyde

Q13: Which is a common name of ethanal?

A. Acetone B. Acetaldehyde C. Formaldehyde D. Propionaldehyde

Q14: What happens when ketones react with 2,4-DNP?

A. Yellow precipitate forms B. Gas is evolved C. No reaction D. Solution turns pink

Q15: Cannizzaro reaction is shown by which compound?

A. Propanal B. Benzaldehyde C. Acetone D. Butanone

Q16: Name the reagent used to prepare aldehydes from alcohols.

A. KMnO4 B. Tollens’ reagent C. PCC D. Grignard reagent

Q17: Which of the following is a ketone?

A. Formaldehyde B. Acetone C. Acetaldehyde D. Benzaldehyde

Q18: Why are aldehydes more reactive than ketones?

A. Less electronegative B. More basic C. Less steric hindrance D. More polar

Q19: How are ketones reduced to alkanes?

A. LiAlH4 B. H2/Ni C. Clemmensen or Wolff–Kishner reduction D. PCC

Q20: The C=O bond in carbonyl compounds is:

A. Non-polar B. Ionic C. Strongly polar D. Triple bond