Aromatic hydrocarbons (containing one benzene ring) of formula C9H12 exist as how many structural isomers?

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Aromatic hydrocarbons (containing one benzene ring) of formula $C X_{9} H X_{12}$ exist as how many structural isomers?

Answer: B

Ring with one propyl-type group: propylbenzene and isopropylbenzene (2). Ethylmethylbenzene: o-, m-, p- (3). Trimethylbenzene: 1,2,3-, 1,2,4-, 1,3,5- (3). Total 8.

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Aromatic hydrocarbons (containing one benzene ring) of formula CX9​HX12​ exist as how many structural isomers?

Answer: B

More questions on Counting structural isomers

Aromatic hydrocarbons (containing one benzene ring) of formula $C X_{9} H X_{12}$ exist as how many structural isomers?