Give the structure and name of each of the following aromatic hydrocarbons

Question

C₈H₁₀; has two possible ring-substituted monobromo derivatives

C₉H₁₂; can give only one mononitro product after nitration

C₉H₁₂ can give four mononitro derivatives after nitration

Answer 1

C8H10: probably p-xylene, that's 1,4-dimethylbenzene

C9H12-- perhaps its 1,3,5-trimethylbenzene that gives only one possible mono-nitro produce.

C9H12: perhaps 1-ethyl-2-methylbenzene, gives on nitro ortho to each EDG alkyl group (the ethyl, the methyl); an gives two more para to each EDG alkyl group, for total of four nitro derivatives.