X is the number of geometrical isomers exhibited by [ Pt ( NH _ 3 ) ( H _ 2 O ) BrCl ]. Y is the number of optically inactive isomer(s) exhibited by [ CrCl _ 2 ( ox )_ 2 ]^ 3- Z is the number of geometrical isomers exhibited by [ Co ( NH _ 3 )_ 3 ( NO _ 2 )_ 3 ]. The value of X + Y + Z is \_\_\_\_.
A. A
For [Pt(NH_3)(H_2O)BrCl] with square planar geometry and four different ligands, geometrical isomerism arises from different positional arrangements: X = 3. For [CrCl_2(ox)_2]^ 3- , the trans isomer is optically inactive (meso compound) while cis is optically active, giving Y = 1. For [Co(NH_3)_3(NO_2)_3] in octahedral geometry, facial (fac) and meridional (mer) isomers are possible: Z = 2. Therefore, X + Y + Z = 3 + 1 + 2 = 6
Related: Chemistry — Coordination Compounds · All PYQ Banks