Question

How many structural isomers are possible when one of the hydrogen atoms is replaced by a chlorine atom in anthracene?

Answer 1

Answer:

Three isomers are possible. Position 1,4,5,8 are equal.

Answer 2

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❥❥ In anthracene, there are 3 sets of equivalent positions(α, β, γ) , thus there are 3 different monochloroanthracenes :1-(same as 4-,5-,8-) , 2-(same as 3-,6-,7-) and 9-(same as 10-)chloroanthracene.

Hence, 3 structural isomers are possible.