# Alcohol or Carbonyl - Which is more reactive towards PCl5?

We're aware that ketones and alcohols both react with phosphorus pentachloride, to produce geminal dichlorides and alkyl chlorides respectively.

What happens in the compound shown below, when treated with $$\ce{PCl5}$$? Which group reacts first? (which is to say, what happens if I were to add just one equivalent of $$\ce{PCl5}$$?)