What happens when Vce=0V and when Vce=-1V?
In the Ic-Vcb characteristic graph, most of them shows around Vcb=-0.4V.
So if Vce=0V(i.e. Vcb=-0.7V) and Vce=-1V(i.e. Vcb=-1.7V) what happens?
Alert for major assumption- you should pay attention to Russell and fix your question- assuming you are talking about an NPN silicon BJT, when the collector voltage becomes much more negative than the base, substantial current will flow across the forward-biased base-collector junction.
If there is -1.7V across the C-B junction the transistor will probably be destroyed, and maybe even with -1V.