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i agree that V2+ is more stable than V3+, but what is the main reason behind it ?

In V3+ There are 2 electrons in 3d orbital while in V2+ there are 3 electrons in 3d orbital.

In case of V2+  there are single electrons in each of the three e.g.  orbitals i.e. e.g. level is half filled while in V3+ there are only 2 electrons in e.g. level and it is partially filled and hence V2+ is more stable than V3+.

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the outer most electronic configuration of V is 3d^3 4s^2. the stable state of s orbital is o and 2.. when V is in its +2 oxidation state, it becomes stable since the s orbital has no electrons in it whereas when it is in the +3 oxidation state, it loses another electron maybe from the d prbital. And hence V^+2 is more stable than V^+3. 

 

I guess the answer i've given is right. Not very sure.

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