Question:

A compound ‘X’ is acidic and it is soluble in NaOH solution, but insoluble in NaHCO3 solution. Compound ‘X’ also gives violet colour with neutral FeCl3 solution. The compound ‘X’ is :
 

Updated On: Dec 29, 2025
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The Correct Option is B

Approach Solution - 1

To determine which compound 'X' corresponds to the given properties, let's analyze each piece of information one step at a time. 

  1. Compound 'X' is acidic and soluble in NaOH solution but insoluble in NaHCO3 solution. This property matches with phenols. Phenols are acidic enough to dissolve in NaOH (strong base) but are not acidic enough to dissolve in NaHCO3 (a weak base).
  2. Compound 'X' gives a violet color with neutral FeCl3 solution. This is a characteristic test for phenolic compounds, where the phenol forms a colored complex with iron (III) ions.

Given the above properties and tests, compound 'X' is likely a phenol. Among the options provided, we need to identify which compound is phenolic. Let's evaluate the provided options with the corresponding images:

The correct structure of phenol (Compound 'X')

Based on the analysis, the above image represents the structure of phenol, which matches all the described properties of compound 'X'. Thus, the correct answer is the structure represented by the image with data-src-id="65c0cc913024a030b43dbda3".

  • The compound is acidic as it is a phenol.
  • Phenols dissolve in NaOH due to their acidic nature but not in NaHCO3 as they are not strong enough acids.
  • The violet color with FeCl3 solution confirms it.
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Approach Solution -2

The correct answer is (B) :

Fig.
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Concepts Used:

Phenols

Phenol is a different class of organic compounds that are usually found in wide usage in an extensive range of industries and also for domestic purposes. Phenol is formed when a hydrogen atom in a benzene molecule is replaced by the chemical -OH group.

Phenol is also called as Carbolic acid. It is an aromatic organic compound having the molecular formula C6H5OH. It is a volatile white crystalline solid. The molecule consists of a phenyl group (−C6H5) bonded to a hydroxy group (−OH). Phenol is mildly acidic, it requires careful handling because it can cause chemical burns.

Classification of Phenol

On the basis of the different number of hydroxyl groups attached, the phenols can be classified further into three types.

  • Monohydric phenols: These contain one -OH group.
  • Dihydric phenols: These contain two -OH groups. These may be ortho-, meta- or para- derivative.
  • Trihydric phenols: These contain three -OH groups.

Properties of Phenol

  1. Phenol is an organic compound that is appreciably soluble in water, with about 84.2 g dissolving in 1000 mL (0.895 M).
  2. It is a weak acid.  
  3. is highly reactive toward electrophilic aromatic substitution.