# What product is formed in the Wurtz reaction of 1-bromo-3-chlorocyclobutane?

I want to do Wurtz reaction of 1-bromo-3-chlorocyclobutane:

Wikipedia suggests to do an intramolecular reaction. Instead, I remember reading somewhere that bromine is more reactive and hence we should do an intermolecular reaction, and attach two carbons to where $\ce{Br}$ was attached.

So, what product is formed in the Wurtz reaction of 1-bromo-3-chlorocyclobutane?