Question

Cumene on oxidation in the presence of air gives a compound X. This in the presence of dilute acid gives Y and Z. The total number of \( sp^2 \) carbons in Y and Z is:

• A. 8
• B. 6
• C. 7
• D. 9

Hint:

Remember, sp2 hybridized carbons are found in double-bonded carbon atoms and aromatic rings. Counting these in molecules can help predict molecular geometry and reactivity.

Answer 1

The Correct Option is C

To solve the problem, we need to calculate the total number of sp² carbons in compounds Y and Z formed from the oxidation of cumene.

1. Understanding the Reaction:
Cumene (isopropylbenzene) undergoes oxidation in the presence of air, forming compound X. Compound X, when treated with dilute acid, produces two products, Y and Z. The key is to identify the number of sp² carbons in Y and Z.

2. Analyzing the Products:
Upon oxidation and acid treatment, cumene (C₉H₁₂) will undergo reactions that introduce functional groups, but we are mainly concerned with the number of carbons that undergo sp² hybridization in the resulting products, Y and Z.

3. Identifying sp² Carbons:
sp² hybridized carbons are typically found in double bonds or in aromatic rings. In the products Y and Z:
Y contains 4 sp² carbons from the benzene ring.
Z also contains 3 sp² carbons from the benzene ring.

Thus, the total number of sp² carbons in both Y and Z is 7.

4. Conclusion:
The total number of sp² carbons in Y and Z is 7.

Final Answer:
The correct answer is (C) 7.