Which of the following statements about aromatic (benzene ring containing) structural isomers is/are correct?

A $C X_{8} H X_{10}$ has 4 isomers
B $C X_{9} H X_{12}$ has 9 isomers
C $C X_{7} H X_{8} O$ has 5 isomers
D $C X_{7} H X_{7} Cl$ has 4 isomers

Answer: A, C, D

C8H10: ethylbenzene + 3 xylenes = 4. C9H12: 2 propylbenzenes + 3 ethyltoluenes + 3 trimethylbenzenes = 8. C7H8O: 3 cresols + benzyl alcohol + anisole = 5. C7H7Cl: 3 chlorotoluenes + benzyl chloride = 4. Correct: A, C, D.

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