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

Step 1: Identify the products Y and Z. Cumene (isopropylbenzene) on oxidation forms cumene hydroperoxide (X). Upon acid-catalyzed cleavage, it yields phenol (Y) and acetone (Z). 
Step 2: Count the \( sp^2 \) carbons. Phenol has four \( sp^2 \) carbons in the aromatic ring. Acetone, a ketone, features a carbonyl carbon that is also \( sp^2 \) hybridized. Thus, the total number of \( sp^2 \) carbons in Y (phenol) and Z (acetone) is 5 (from phenol) + 2 (from acetone) = 7.