Question
Consider the following reaction of benzene. In compound (Q), the percentage of oxygen is \_\_\_\_ %. (Nearest integer)
JEE Main
Chemistry
Hydrocarbons
2026
JEE Main 2026 (23 January Shift 2)
JEE Main Chemistry Question (2026) — Solution
Options
- A. A
- B. B
- C. C
- D. D
Answer
A. A
Step-by-step solution
Benzene reacts with CH _3 -CO-CH _2 -CH _2 -CO-Cl in the presence of anhydrous AlCl _3 (Friedel-Crafts acylation) to give product P (a keto-ketone). P on treatment with aq. NaOH and heating undergoes intramolecular aldol condensation to give a cyclic enone Q. Molecular mass of Q = 157 Percentage of oxygen in Q = 16 157 100 = 10.19\% 10\%
Related: Chemistry — Hydrocarbons · All PYQ Banks