19.5 g of CH₂FCOOH is dissolved in 500 g of water. The van’t Hoff factor and dissociation constant of fluoroacetic acid will be respectively -

($∆{\mathrm{T}}_{\mathrm{f}}$ = 1.00 K )

1) 20.75 , 4.77 x 10^-3

2) 1.075 ,  4.77 x 10^-2

3) 2.073 , 3.07 x 10^-4

4) 1.075 , 3.07 x 10^-3