Identify the major products A and B for the below given reaction sequence.
Identify the major products A and B for the below given reaction sequence.
The Correct Option is B
Approach Solution - 1
To identify the major products A and B in the given reaction sequence, let's analyze each step:
- Friedel-Crafts Alkylation: The first step involves the reaction of benzene with isopropyl chloride (CH3CHClCH3) in the presence of AlCl3, a Lewis acid. This results in the formation of isopropylbenzene (cumene).
- Oxidation: The cumene is then oxidized with O2 followed by an acid treatment (H+, H2O) to form phenol and acetone. This is known as the cumene process. Product P is phenol.
- Oxidation of Phenol: Phenol (P) is further oxidized using sodium dichromate (Na2Cr2O7) and sulfuric acid (H2SO4) to form benzoquinone, which is product A.
- Bromination of Phenol: Phenol (P) reacts with bromine (Br2) in carbon disulfide (CS2) to give 2,4,6-tribromophenol, which is product B.
Thus, the major products of the reaction sequence are:
- Product A: Benzoquinone
- Product B: 2,4,6-Tribromophenol
The correct answer based on the given options is:
Approach Solution -2
From the given-
Therefore Option is (B) is Correct.
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Concepts Used:
Alcohols, Phenols and Ethers - Classification
Classification of Alcohols Phenols and Ethers are as follows:
On the basis of dependence on the attachment of hydroxyl groups, alcohol can be classified into three different types:
- Monohydric alcohols
- Dihydric alcohols
- Trihydric alcohols
On the basis of dependence on the different number of carbon atoms in a molecule that are bonded with the -OH group, alcohol can be classified into three different types:
- Primary alcohols
- Secondary alcohols
- Tertiary alcohols
On the basis of the attachment of the different number of hydroxyl groups, the phenols can be classified further into three types:
- Monohydric phenols
- Dihydric phenols
- Trihydric phenols
The Classification is dependant on the type of the alkyl or aryl groups attached to the oxygen atom in ether group, thus it can be classified into two types:
- Symmetrical ether
- Unsymmetrical ether