Consider the following ligands $N H_{2}^{-}$ , acac (Acetylacetone), $O H^{-}$ , Gly, $O_{2}^{-}$ , Phen, DMG, $N O_{2}^{-}, C O_{3}^{2 -}, C l^{-}, C H_{3} C O O^{-}, e n, S O_{4}^{2 -}, N_{2}^{-}$ . Then calculate value of " $P + Q - R - S "$ . Here
P: Total number of ligands which act as bridging as well as monodentate only.
Q: Total number of flexidentate ligands.
R: Total number of bidentate ligands only.
S: Total number of unsymmetrical bidentate ligands.

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Solution

The correct option is D 1
P: Total number of ligands which act as bridging as well as monodentate only.
Q: Total number of flexidentate ligands
R: Total number of bidentate ligands only
S: Total number of unsymmetrical bidentate ligands
$P = N H_{2}^{-}, O_{2}^{-}, O H^{-}, C l^{-} = 4$
$Q = S O_{4}^{2 -}, N_{2}^{-}, C O_{3}^{2 -}, C H_{3} C O O^{-} = 4$
$R = e n, a c a c, P h e n, D M G, G l y = 5$
$S = D M G, G l y = 2$
$P + Q - R - S = 4 + 4 - 5 - 2 = 1$
Hence, the value of $P + Q - R - S$ is $1$ .

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