The two isomers X and Y with the formula `Cr(H_(2)O)_(5)ClBr` were taken for experiment on depression in freezing point. It was found that one mole of X gave depression corresponding to 2 moles of particles and one mole of Y gave depression to 3 moles of particles. The structural formulae of X and Y raspectively are

Options

A. `[Cr(H_(2)O)_(5)Cl]Br_(2), [Cr(H_(2)O)_(4)Br_(2)]Cl. H_(2)O`
B. `[Cr(H_(2)O)_(5)Br]BrCl, [Cr(H_(2)O)_(4)ClBr]Br.H_(2)O`
C. `[Cr(H_(2)O)_(5)Cl]Br_(2), [Cr(H_(2)O)_(4)ClBr]Br.H_(2)O`
D. `[Cr(H_(2)O)_(4)Br_(2)]Cl.H_(2)O, [Cr(H_(2)O)_(5)Cl]Br_(2)`

Answer

D

Explanation

1 mole of complex X giving 2 moles of particles will be `[Cr(H_(2)O)_(4)Br_(2)]Cl.H_(2)O`, i.e.,`[Cr(H_(2)O)_(4)Br_(2)]^(+)+Cl_(-)`
1 mole of complex Y giving 3 moles of particles will be `[Cr(H_(2)O)_(5)Cl]Br_(2)`, i.e.,
`[Cr(H_(2)O)_(5)Cl^(-)]^(2-)+2Br^(-)`.