Can Two Halides on a Phenyl Ring Be Replaced with Just One KCN Molecule?

[Huej]

So if an alkyl halide reacts with KCN, the halide gets replaced with CN. But what if I was using a phenyl ring with two halides, Br and I attached, let's say, para to each other. If I react with KCN, do both halides get replaced, or would I need double moles of KCN to do that?

 

[Borek]

Regardless of everything else stoichiometry tells you you can't replace quantitatively TWO halides with ONE -CN.

Phenyl hardly counts as an alkyl.