Join WhatsApp Icon JEE WhatsApp Group
Question 69

Given below are two statements : 
Statement I:

image

 are two anomers of D-(+)-glucose.
Statement II: the Open chain forms of D-glucose and D-fructose contain three similar chiral carbons at C₃, C₄, and C₅. 
In the light of the above statements, choose the correct answer from the options given below:

To determine the correct answer, we analyze both statements using the principles of carbohydrate chemistry.

The given structures differ only in the configuration of the hydroxyl group at the anomeric carbon ($$C_1$$). Anomers are a special type of epimers that differ only in the configuration at the anomeric carbon formed during cyclization. Since one structure has the hydroxyl group in the $$\alpha$$-orientation and the other in the $$\beta$$-orientation, they represent the $$\alpha$$- and $$\beta$$-anomers of D-(+)-glucose. Therefore, Statement I is true.

The open-chain form of D-glucose is $$CHO-CH(OH)-CH(OH)-CH(OH)-CH(OH)-CH_2OH$$, with chiral carbon atoms at $$C_2$$, $$C_3$$, $$C_4$$, and $$C_5$$. The open-chain form of D-fructose is $$CH_2OH-C(=O)-CH(OH)-CH(OH)-CH(OH)-CH_2OH$$, with chiral carbon atoms at $$C_3$$, $$C_4$$, and $$C_5$$. The configurations at $$C_3$$, $$C_4$$, and $$C_5$$ are identical in both molecules, so they possess three similar chiral carbon atoms at these positions. Therefore, Statement II is also true.

Hence, both Statement I and Statement II are true, and the correct answer is Option (A).

Get AI Help

Video Solution

video

Create a FREE account and get:

  • Free JEE Mains Previous Papers PDF
  • Take JEE Mains paper tests

Free JEE Topicwise Questions

JEE Rotational MotionJEE Units & MeasurementsJEE Atomic StructureJEE GravitationJEE Periodic Table & PeriodicityJEE StatisticsJEE Inverse Trigonometric FunctionsJEE Magnetism & Magnetic MaterialsJEE Sequences & SeriesJEE MatricesJEE Alternating CurrentsJEE Carboxylic AcidsJEE Permutations & CombinationsJEE Work, Energy & PowerJEE Electromagnetic InductionJEE Electronic DevicesJEE d and f-Block ElementsJEE Chemical KineticsJEE Heat TransferJEE Three Dimensional GeometryJEE Magnetic Effects of CurrentJEE Hydrocarbons - AromaticJEE Electromagnetic WavesJEE Aldehydes & KetonesJEE Hydrocarbons - AlkanesJEE Applications of DerivativesJEE EquilibriumJEE Indefinite IntegrationJEE Chemical ThermodynamicsJEE ElectrochemistryJEE ProbabilityJEE BiomoleculesJEE Continuity & DifferentiabilityJEE Kinetic Theory of GasesJEE Vector AlgebraJEE Hydrocarbons - AlkynesJEE Differential EquationsJEE Current & ResistanceJEE Straight LinesJEE WavesJEE Redox ReactionsJEE Hydrocarbons - AlkenesJEE DeterminantsJEE SolutionsJEE Ray OpticsJEE Dual Nature of Matter & RadiationJEE Chemical Bonding & Molecular StructureJEE Complex NumbersJEE Sets, Relations & FunctionsJEE Electric Charges & FieldsJEE Laws of MotionJEE Fluid MechanicsJEE Basic Concepts in ChemistryJEE Trigonometric FunctionsJEE LimitsJEE Laws of ThermodynamicsJEE Kinematics - 2D MotionJEE p-Block Elements (Groups 13-18)JEE Simple Harmonic MotionJEE Electric Potential & CapacitanceJEE Coordination CompoundsJEE JEE 2D GeometryJEE CirclesJEE Definite IntegrationJEE EMF & Circuit AnalysisJEE Surface TensionJEE Atoms & NucleiJEE Laboratory Experiments - XIJEE Number SystemJEE Basic Principles of Organic ChemistryJEE Wave OpticsJEE Quadratic EquationsJEE Alcohols, Phenols & EthersJEE Organic Compounds with HalogensJEE DifferentiationJEE Conic SectionsJEE Nitrogen-Containing CompoundsJEE ElasticityJEE Practical Organic ChemistryJEE Kinematics - 1D MotionJEE Purification & CharacterisationJEE Binomial Theorem
Ask AI