We know that, Q=CV so QVC=(CV)VC=V2
So we have to find out only dimension of V2
Volatge V=Ed=FQd
We know that dimension of force, [F]=[MLT−2], distance [d]=[L] and charge [Q]=[kT] (as charge = current× time)
Now, [V]=[MLT−2][kT][L]=[ML2T−3k−1]
Thus, [V2]=[M2L4T−6k−2]