Question

The major products ' A ' and ' B ', respectively, are

• A.
• B.
• C.
• D.

Hint:

In organic reactions, the type of reagent and reaction conditions (such as temperature and concentration of acid) play a key role in determining the products. Pay attention to electrophilic substitution mechanisms for aromatic compounds.

Answer 1

The Correct Option is B

To determine the major products ' A ' and ' B ', let's analyze the reactions shown in the image.

The initial compound is isobutylene, and the reactions involve sulfuric acid (H₂SO₄) at different conditions:

For the formation of product 'A':

Cold, concentrated H₂SO₄ is used. This typically leads to an addition reaction where the alkene undergoes electrophilic addition with H₂SO₄, resulting in the formation of an alkyl hydrogen sulfate.

The reaction mechanism involves the protonation of the double bond, forming a carbocation, followed by the nucleophilic attack of HSO₄^-.

For the formation of product 'B':

Heating with H₂SO₄ at 80°C is performed. Under these conditions, the previously formed alkyl hydrogen sulfate can undergo elimination to form the corresponding alcohol.

This results in a dehydration reaction, leading to the formation of isopropanol (secondary alcohol).

The correct answer option is as shown in the image:

In the given reaction, electrophilic substitution of the phenyl group with a sulfate group is induced. The major products are: