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NEET CHEMISTRYAlcohols, Phenols and EthersEasy

Question

Incorrect statement among the following is:

A

FeCl₃ is used in the detection of phenol.

B

Fehling solution is used in the detection of glucose.

C

Tollen reagent is used in the detection of unsaturation.

D

NaHSO₃ is used in the detection of carbonyl compounds.

Step-by-Step Solution

  1. FeCl₃ Test: Neutral Ferric Chloride (FeCl3FeCl_3) is indeed used to detect phenols. It reacts with phenols to give a violet-coloured complex.
  2. Fehling's Solution: This is a standard test for reducing sugars like glucose. It oxidizes glucose, and in the process, the copper(II) ions are reduced to a red precipitate of copper(I) oxide (Cu2OCu_2O).
  3. Tollen's Reagent: Tollen's reagent (Ammoniacal Silver Nitrate) is used to detect aldehydes (which reduce it to metallic silver, forming a 'silver mirror'), not unsaturation. Unsaturation (double/triple bonds) is detected using Bromine water (which gets decolourised) or Baeyer's reagent (alkaline KMnO4KMnO_4, which gets decolourised) .
  4. NaHSO₃ Test: Sodium hydrogen sulphite (NaHSO3NaHSO_3) forms crystalline addition products with aldehydes and ketones (carbonyl compounds), which is used for their separation and purification.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Alcohols, Phenols and Ethers. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYAlcohols, Phenols and Ethersincorrectstatementfollowing

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A.Benzaldehyde
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A.Option 1
B.Option 2
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