PYQSide ExamsMy practice

Aldehydes, Ketones and Carboxylic Acids · Question 36

JEE Main 2025 (Online) 29th January Morning ShiftMCQEasy📈 Topic in 10% papers+4−1
1

The product (P) formed in the following reaction is : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(4) [figure]

Solution

Zn–Hg/conc. HCl (Clemmensen reduction) reduces the carbonyl group of aldehydes and ketones to CH2 ( >C=O >CH2).

Ketone: -COCH3 -CH2CH3

Aldehyde: -CHO -CH3

The ester group (-COOC2H5) is not reduced under these conditions.

P = ethyl 3-ethyl-5-methylbenzoate:

[figure]

Answer: (4)

JEE Main 2025 (Online) 29th January Morning Shift

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

[figure] 0.1 mole of compound 'S' will weigh g. (Given molar mass in g mol-1 C : 12, H : 1, O : 16)

JEE Main 2025 (Online) 29th January Morning Shift
3

Both acetaldehyde and acetone (individually) undergo which of the following reactions? Choose the correct answer from the options given below:

  1. C and E Only
  2. A, B and D Only
  3. A, C and E Only
  4. B, C and D Only
JEE Main 2025 (Online) 28th January Morning Shift
4

The compounds that produce CO2 with aqueous NaHCO3 solution are: Choose the correct answer from the options given below:

  1. A and C Only
  2. A, B and E Only
  3. A and B Only
  4. A, C and D Only
JEE Main 2025 (Online) 28th January Morning Shift
5

The total number of compounds from below when treated with hot KMnO4, giving benzoic acid is: [figure] , [figure] , [figure] , [figure] , [figure] , [figure] , [figure] , [figure]

  1. 4
  2. 3
  3. 5
  4. 6
JEE Main 2025 (Online) 28th January Evening Shift

All Aldehydes, Ketones and Carboxylic Acids PYQs →

PDFDownload Aldehydes, Ketones and Carboxylic Acids PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structurep-Block Elements (Group 13 & 14)p-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry