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#chirality

10 public questions tagged with this topic.

CHEMISTRY

Which complex shows optical isomerism?

[PtCl₂(en)2]^{2+ (cis isomer) with two bidentate en ligands in a square planar geometry is chiral, showing optical isomerism (d and l forms). This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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Amino Acids Basics

Which of the following amino acids does NOT have a chiral center?

Glycine is the correct choice because it does not accurately describe or belong to the category addressed in this question. In the context of Amino Acids Basics, the other options (Alanine, Cysteine, and Histidine) are all valid and well-established concepts. Glycine is either unrelated to the topic, describes a different biological process, or represents a common misconception. Questions framed as 'which is NOT' require students to identify the exception among otherwise correct statements, demanding comprehensive knowledge of the topic rather than recognition of a single fact.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3

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Amino Acids Basics

The D-L system of amino acid classification is based on:

Fischer projection is the scientifically accurate answer to this question. Within the study of Amino Acids Basics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Fischer projection directly address what is being asked. Among the other options, Optical rotation, Isoelectric point, and Side chain properties do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3

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Amino Acids Basics

The specific rotation of an amino acid is dependent on:

All of the above is the scientifically accurate answer to this question. Within the study of Amino Acids Basics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of All of the above directly address what is being asked. Among the other options, Wavelength of light, Temperature, and Concentration do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3

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Amino Acids Basics

The RS system is used to define chirality based on:

Substituent priority is the scientifically accurate answer to this question. Within the study of Amino Acids Basics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Substituent priority directly address what is being asked. Among the other options, Optical rotation, Protonation state, and Charge distribution do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 3

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