Aldehydes, Ketones, and Carboxylic Acids contain a carbon-oxygen double bond known as a carbonyl group. The carbonyl group is bonded to a carbon and hydrogen atom in aldehyde. The general formula RCHO represents it. In contrast, the carbonyl group is bonded to two carbon atoms in ketone. It is represented by the general formula R (CO) R’. While in carboxylic acid, the carbonyl group is bonded to a carbon atom and a hydroxyl group. The general formula RCOOH represents it.
Most of the characteristics of the aldehydes, ketones, and carboxylic acid are due to the presence of the carbonyl group.
Download Class 12 Chemistry Worksheet on Chapter 12 Aldehydes, Ketones, and Carboxylic Acids PDF – Set 3
CBSE Class 12 Chemistry Chapter 12 Aldehydes, Ketones, and Carboxylic Acids Worksheet – Set 3
Q1. Which of the following compound can be oxidised to prepare ethyl methyl ketone?
(a) Propanal
(b) Butanal
(c ) Tertiary butyl alcohol
(d) None of the above
Q2. Acetaldehyde on the treatment of a few drops of sulphuric acid gives
(a) Paraldehyde
(b) Ethyl methyl amine
(c ) Ethyl alcohol
(d) None of the above
Q3. The enolic form of acetone contains
(a) 9 sigma bonds, 1 pi bond and 2 lone pairs
(b) 8 sigma bonds, 2 pi bonds and 2 lone pairs
(c ) 10 sigma bonds, 1 pi bond and 1 lone pair
(d) 9 sigma bonds, 2 pi bonds and 1 lone pair
Q4. Methyl ketones are categorised through
(a) The tollen’s reagent,
(b) The iodoform test
(c ) The Benedict test
(d) None of the above
Q5. Schiff’s reagent is
(a) Decolourisation of magenta solution with sulphurous acid
(b) Decolourisation of magenta solution with chlorine
(c ) Ammonical cobalt chloride solution
(d) Ammonical manganese sulphate solution
Q6. Write the IUPAC name of the compound mentioned below.
CH3-CH2-CH2-CH=C(C2H5)-C(H)=O
Q7. Write the IUPAC and common name of (CH3)3 C CHO.
Q8. How will you convert butyne to butan-2-one?
Q9. Name the reagents that can be used to bring about the following conversion.
(a) Hexanol to hexanal
(b) Cyclohexanol to cyclohexanone
(c ) 4- Fluoro toluene to 4- Fluoro benzaldehyde
Q10. What is the difference between a carbon-carbon double bond and a carbon-oxygen double bond?
Q11. Arrange the following carbonyl compounds in order of reactivities in the nucleophilic addition reaction.
Ethanal, propanal, propanone, and butanone.
Q12. Why is benzaldehyde less reactive than propanal?
Q13. Convert benzaldehyde to α- Hydroxy phenylacetic acid.
Q14. Complete the reaction.
Q15. Identify A and B in the following reaction.
2HCHO + conc.KOH –> A + B
Q16. Convert toluene to benzoic acid.
Q17. Which Grignard reagent would be used to make the following conversions.
(a) Acetophenone to 2 Phenyl-2-butanol.
(b) Cyclo hexanone to 1-Propyl cyclo hexanol.
Q18. Identify A in the following reaction.
Q19. An unknown aldehyde ‘A’ on reacting with alkali gives a B-hydroxy-aldehyde, which loses water to form an unsaturated aldehyde, 2-butenal. Another aldehyde, B, undergoes a disproportionation reaction in the presence of concentrated alkali to form products C and D. C is aryl alcohol with the formula C7H8O.
(a) Identify A and B.
(b) Write the sequence of reactions involved.
(c) Name the product when ‘B’ reacts with zinc amalgam and hydrochloric acid.
Q20. An organic compound (A) with molecular formula C8H8O forms an orange-red precipitate with 2, 4-DNP reagent and gives yellow precipitate on heating with iodine in the presence of sodium hydroxide. It neither reduces Tollen’s reagent or Fehling solution, nor does it decolorise bromine water or Baeyer’s reagent. On severe oxidation with chromic acid, it gives a carboxylic acid (B) having molecular formula C7H6O2. Identify the compound (A) and (B).
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