Question

Which of the following statement is true about the complex $\left[CrC{l}_3\right(OH{)}_2\left(N{H}_3\right){]}^{2-}$ ion?

• A. It has three geometrical isomers
• B. Only one space isomers is optically active and remaining are inactive
• C. There are total four space isomers
• D. The magnetic moment of complex ion is $3.89BM$

Answer 1

Answer: (A), (D)

It has three geometrical isomers
The magnetic moment of complex ion is $3.89BM$

(A) The complex $\left[CrC{l}_3\right(OH{)}_2\left(N{H}_3\right){]}^{2-}$ has three geometrical isomers, one is cis and two are trans.
Thus option A is correct.
(B) All the three geometrical isomers are optically inactive as they contain elements of symmetry.
Thus option B is incorrect.
(C) There are total three stereoisomers.
Thus option C is incorrect.
(D) The oxidation state of chromium is +3. It contains 3 unpaired electrons in d orbitals
The magnetic moment of complex ion is 3.89 BM.
Thus option D is correct.