Question

Which compound’s common name is cumene?

• A. Isopropylbenzene
• B. Methylbenzene
• C. Ethylbenzene
• D. Propylbenzene

Hint:

In organic chemistry, common names often differ from IUPAC names, like cumene for isopropylbenzene.

Answer 1

The Correct Option is A

Step 1: Identifying the structure.
Cumene is the common name for isopropylbenzene. It consists of a benzene ring with an isopropyl group (\( \text{C}_3\text{H}_7 \)) attached to it.
Step 2: Conclusion.
Thus, the correct answer is option (A), Isopropylbenzene, which is also known as cumene.

Answer 2

Step 1: Cumene is the everyday name for a benzene ring with an isopropyl group attached to it.

Step 2: That structure is chemically called isopropylbenzene.

Step 3: So the compound whose common name is cumene is isopropylbenzene — option (A).

Answer 3

Elimination approach: Methylbenzene is the common name toluene, not cumene, so that's ruled out. Ethylbenzene keeps its own name and isn't called cumene either. Propylbenzene, with a straight-chain propyl group, isn't cumene. Cumene specifically refers to the branched isopropyl substituent on benzene, so isopropylbenzene, option (A), is correct.