The degree of dissociation of a weak electrolyte, `A_xB_y` is related to Van't Hoff factor by the expression:

Options

A. `alpha=(x+y-1)/(i-1)`
B. `alpha=(x+y+1)/(i-1)`
C. `alpha=(i-1)/(x_Y-1)`
D. `alpha=(i-1)/(x+y-1)`