PYQSide ExamsMy practice

Isomerism · Question 1

NEET (UG) 2026MatchingMedium📈 Topic in 12% papers+4−1
1

Match List I with List II :

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

Answer

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

Solution

A. [Pt(NH3)2Cl2]: square planar [MA2B2] type ⇒ cis and trans forms ⇒ geometrical isomerism (III)

B. [Co(en)3]3+: three didentate ligands ⇒ non-superimposable mirror images (d and l) ⇒ optical isomerism (I)

C. [Co(NH3)5NO2]Cl2: ambidentate NO2- binds through N (nitrito-N) or O (nitrito-O) ⇒ linkage isomerism (IV)

D. [Cr(H2O)6]Cl3: water inside or outside the coordination sphere, e.g. [Cr(H2O)5Cl]Cl2 H2O ⇒ solvate (hydrate) isomerism (II)

∴ A-III, B-I, C-IV, D-II

Answer: (3)

NEET (UG) 2026

Keep practising — Isomerism

2

The pair of molecules that are metamers among the following is :

  1. CH3OCH2CH2CH3 and CH3CH2OCH2CH3
  2. CH3CH2CH2OH and CH3-CH(OH)-CH3
  3. CH3CH2CH2CH2CH3 and (CH3)2CHCH2CH3
  4. [figure] and [figure]
NEET (UG) 2026
3

How many products (including stereoisomers) are expected from monochlorination of the following compound? [figure]

  1. 5
  2. 6
  3. 2
  4. 3
NEET (UG) 2025
4

Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula C4H8O is :

  1. 10
  2. 11
  3. 6
  4. 8
NEET (UG) 2025
5

Which one of the following compounds can exist as cis-trans isomers?

  1. 1,1-Dimethylcyclopropane
  2. 1,2-Dimethylcyclohexane
  3. Pent-1-ene
  4. 2-Methylhex-2-ene
NEET (UG) 2025
6

The incorrect statement regarding chirality is

  1. SN1 reaction yields 1 : 1 mixture of both enantiomers
  2. The product obtained by SN2 reaction of haloalkane having chirality at the reactive site shows inversion of configuration
  3. Enantiomers are superimposable mirror images on each other
  4. A racemic mixture shows zero optical rotation
NEET (UG) 2022
7

The compound which shows metamerism is :

  1. C4H10O
  2. C5H12
  3. C3H8O
  4. C3H6O
NEET (UG) 2021
8

Dihedral angle of least stable conformer of ethane is :

  1. 0
  2. 120
  3. 180
  4. 60
NEET (UG) 2021
9

With respect to the conformers of ethane, which of the following statements is true?

  1. Bond angle changes but bond length remains same.
  2. Both bond angle and bond length change.
  3. Both bond angle and bond length remain same.
  4. Bond angle remains same but bond length changes.
NEET 2017
10

Which of the following biphenyls is optically active ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET 2016 (Phase 1)
11

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is

  1. the eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain
  2. the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
  3. the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
  4. the eclipsed conformation of ethane is more stable than staggered conformation, because eclipsed conformation has no torsional strain.
NEET 2016 (Phase 1)

All Isomerism PYQs →

PDFDownload Isomerism PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical KineticsSurface Chemistry
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureHydrogens-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-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 AcidsAminesBiomoleculesPolymersChemistry in Everyday LifePrinciples Related to Practical Chemistry