o-, m- and p-Xylene (the three dimethylbenzenes) are each monochlorinated, ring and side-chain products both being counted (structural isomers only, no stereoisomers). What is the total number of distinct monochloro compounds obtainable from the three xylenes?

Answer: C

o-Xylene: 2 ring (positions 3 and 4) + 1 side-chain = 3. m-Xylene: 3 ring (positions 2, 4, 5) + 1 side-chain = 4. p-Xylene: 1 ring + 1 side-chain = 2. Total = 3 + 4 + 2 = 9. Products from different xylenes cannot coincide.

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