A metal complex having composition `[Cr(NH_(3))_(4)Br_(2)I]` was isolated in two forms (X) and (Y). Form (X) reacts with `AgNO_(3)` to give a pale yellow precipitate which is partially soluble in excess of `NH_(4)OH` whereas (Y) gives a greenish yellow precipitate which is insoluble in `NH_(4)OH`.
Which of the following statement is true?

Options

A. (X)-cis form optically inactive (Y)-cis form optically active
B. (X)-cis form optically inactive (Y)- trans form optically active
C. The cis and trans forms of both X and Y are optically active
D. The cis and trans form of both X and Y are optically inactive.

Answer

d

Explanation

X has one `Br^(-)` ion outside the co-ordination sphere. Y has `I^(-)` outside the co-ordination sphere. Note AgBr is partially soluble in ammonia whereas AgI is insoluble.