Ochem help

[ToZanarkand]

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Please, see the attachment and tell me
1) what is the hv means
2) why Br didn't go to the ortho/para direction on benzene ring

Thank you so much for your help.

 

[ToZanarkand]

I figure it out 2), but I still don't know the meaning of hv.

 

[herkulease]

hv is light.

 

[ToZanarkand]

hv is light.

Oh...I see. Thank you 🙂