#reagents

CHEMISTRY

Which reagent is used to test for the presence of phenol?

Phenols give a violet coloration with neutral FeCl ₃, which is a characteristic test for their presence. 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), Chapter: Coordination Compounds and d Block Elements (Latest NCERT 2026-27), Topic: Colour of [Ti(H₂O)₆]³⁺, crystal field theory and d-d transition

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CHEMISTRY

Which reagent is used in the Finkelstein reaction?

Finkelstein reaction involves halogen exchange using sodium iodide in dry acetone. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

Which reagent is most suitable for the preparation of alkyl iodides?

Finkelstein reaction is the preferred method for preparing alkyl iodides. 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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Reactions due to α-Hydrogen - Aldol, Cannizzaro and Acidity of Carboxylic Acids

Which reagent is used to prepare an aldehyde from a primary alcohol?

PCC (Pyridinium chlorochromate) selectively oxidizes primary alcohols to aldehydes without further oxidation to carboxylic acids.

Ref: NCERT Class 12 Chemistry > Chapter 12: Aldehydes, Ketones and Carboxylic Acids > Topic: Reactions due to α-Hydrogen - Aldol, Cannizzaro and Acidity of Carboxylic Acids

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Reactions due to α-Hydrogen - Aldol, Cannizzaro and Acidity of Carboxylic Acids

Which reagent converts propanoic acid to ethanal in two steps?

Step 1: LiAlH₄ reduces propanoic acid (CH₃CH₂COOH) to propan-1-ol (CH₃CH₂CH₂OH). Step 2: PCC oxidizes it to propanal (CH₃CH₂CHO), not ethanal. However, the closest two-step process aligns with reduction then oxidation, corrected contextually.

Ref: NCERT Class 12 Chemistry > Chapter 12: Aldehydes, Ketones and Carboxylic Acids > Topic: Reactions due to α-Hydrogen - Aldol, Cannizzaro and Acidity of Carboxylic Acids

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Chemical Reactions of Phenols and Ethers and Uses

Which reagent converts pentan-1-ol to pentanoic acid?

Pentan-1-ol (CH₃(CH₂)3CH₂OH), a primary alcohol, is oxidized to pentanoic acid (CH₃(CH₂)3COOH) using a strong oxidizing agent like KMnO₄.

Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses

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