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NCERT Solutions › Chemistry › Chapter 12

Chapter 12: Aldehydes Ketones

NCERT Solutions for CBSE Class 10 Chemistry — 22 solved questions with detailed explanations.

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Questions
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Solved Questions

Q1. The reagent used in Tollens' test is:

Difficulty: Easy · Topic: Tollens' Test

Solution

Tollens' reagent = [Ag(NH₃)₂]⁺ (ammoniacal silver nitrate). Gives silver mirror with aldehydes.

Q2. Aldol condensation is given by:

Difficulty: Easy-Medium · Topic: Aldol

Solution

Aldol condensation requires α-hydrogen. Formaldehyde and benzaldehyde lack α-H and cannot undergo aldol condensation alone.

Q3. Cannizzaro reaction is given by aldehydes that:

Difficulty: Easy-Medium · Topic: Cannizzaro

Solution

Cannizzaro reaction: aldehydes without α-H undergo disproportionation in strong base (e.g., HCHO, PhCHO).

Q4. Fehling's test distinguishes:

Difficulty: Easy-Medium · Topic: Aldehydes Ketones

Solution

aliphatic aldehydes from ketones.

Q5. Clemmensen reduction uses:

Difficulty: Easy-Medium · Topic: Aldehydes Ketones

Solution

Zn-Hg/conc. HCl.

Q6. Wolff-Kishner reduction uses:

Difficulty: Easy-Medium · Topic: Aldehydes Ketones

Solution

NH₂NH₂/KOH.

Q7. HCN addition to carbonyl is:

Difficulty: Easy-Medium · Topic: Aldehydes Ketones

Solution

nucleophilic addition.

Q8. Tollens' test (silver mirror) is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Tollens' test (silver mirror) detects Aldehydes.

Q9. Fehling's test (red precipitate) is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Fehling's test (red precipitate) detects Aliphatic aldehydes.

Q10. Iodoform test is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Iodoform test detects Methyl ketones/ethanol.

Q11. Lucas test is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Lucas test detects 1°/2°/3° alcohols.

Q12. Carbylamine test is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Carbylamine test detects Primary amines.

Q13. Hinsberg test is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Hinsberg test detects 1°/2°/3° amines.

Q14. Biuret test is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Biuret test detects Proteins (peptide bonds).

Q15. Molisch test is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Molisch test detects Carbohydrates.

Q16. Benedict's test is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Benedict's test detects Reducing sugars.

Q17. Ninhydrin test is used to detect:

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Ninhydrin test detects Amino acids.

Q18. Cannizzaro reaction involves:

Difficulty: Easy-Medium · Topic: Named Reactions

Solution

Cannizzaro reaction: Aldehyde without α-H + NaOH → acid + alcohol.

Q19. Aldol condensation involves:

Difficulty: Easy-Medium · Topic: Named Reactions

Solution

Aldol condensation: Aldehyde/ketone with α-H → β-hydroxy carbonyl.

Q20. Sandmeyer reaction involves:

Difficulty: Easy-Medium · Topic: Named Reactions

Solution

Sandmeyer reaction: ArN₂⁺ + CuX → ArX.

Q21. IUPAC name of CH₃CHO:

Difficulty: Easy-Medium · Topic: IUPAC

Solution

CH₃CHO = Ethanal (Acetaldehyde).

Q22. IUPAC name of CH₃COOH:

Difficulty: Easy-Medium · Topic: IUPAC

Solution

CH₃COOH = Ethanoic acid (Acetic acid).

Other Chapters in Chemistry

Ch 1: Solid StateCh 2: SolutionsCh 3: ElectrochemistryCh 4: Chemical KineticsCh 5: Surface ChemistryCh 6: Isolation of ElementsCh 7: p-Block ElementsCh 8: d & f Block ElementsCh 9: Coordination CompoundsCh 10: Haloalkanes & HaloarenesCh 11: Alcohols Phenols EthersCh 13: AminesCh 14: BiomoleculesCh 15: PolymersCh 16: Chemistry in Everyday Life

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