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Isomerism · Question 8

JEE Main 2026 (Online) 21st January Evening ShiftMatchingEasy📈 Topic in 23% papers+4−1
1

Match List - I with List - II. Choose the correct answer from the options given below :

  1. A-III, B-I, C-IV, D-II
  2. A-II, B-I, C-IV, D-III
  3. A-I, B-IV, C-III, D-II
  4. A-III, B-I, C-II, D-IV

Answer

(1) A-III, B-I, C-IV, D-II

Solution

A. (CH3)2C=CH2 and CH2=CH-CH2-CH3 (C4H8): branched and straight carbon skeleton chain isomers (III).

B. cis- and trans-but-2-ene: same connectivity, different spatial arrangement stereoisomers (geometrical) (I).

C. CH3-CH(OH)-CH2-CH3 (alcohol) and C2H5-O-C2H5 (ether), both C4H10O functional group isomers (IV).

D. CH2=CH-CH2-CH3 and CH3-CH=CH-CH3: different position of the double bond position isomers (II).

A-III, B-I, C-IV, D-II

Answer: (1)

JEE Main 2026 (Online) 21st January Evening Shift

Keep practising — Isomerism

2

Given below are four compounds : (a) n-propyl chloride (b) isopropyl chloride (c) sec-butyl chloride (d) neopentyl chloride Percentage of carbon in the one which exhibits optical isomerism is :

  1. 46
  2. 40
  3. 52
  4. 56
JEE Main 2026 (Online) 21st January Evening Shift
3

The number of optically active products obtained from the complete ozonolysis of the given compound is : [figure]

  1. 4
  2. 0
  3. 2
  4. 1
JEE Main 2025 (Online) 7th April Evening Shift
4

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Both Statement I and Statement II are correct
  2. Statement I is incorrect but Statement II is correct
  3. Both Statement I and Statement II are incorrect
  4. Statement I is correct but Statement II is incorrect
JEE Main 2025 (Online) 7th April Evening Shift
5

Identify the correct statements from the following. Choose the correct answer from the options given below:

  1. B & C Only
  2. C & D Only
  3. A,B & C Only
  4. A & B Only
JEE Main 2025 (Online) 3rd April Morning Shift
6

The total number of structural isomers possible for the substituted benzene derivatives with the molecular formula C9H12 is .

JEE Main 2025 (Online) 3rd April Evening Shift
7

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are false
JEE Main 2025 (Online) 28th January Evening Shift

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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