Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type $[P d (C_{6} H_{5})_{2} (S C N)_{2}]$ and $[P d (C_{6} H_{5})_{2} (N C S)_{2}]$ are
(a) linkage isomers
(b) coordination isomers
(c) ionisation isomers
(d) geometrical isomers

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Solution

The ligand(s) which has two different bonding sites are known as ambident ligands e.g., NCS, $N O_{2}$ etc.
Here, NCS has two binding sites at N and S.
Hence, NCS (thiocyanate) can bind to the metal ion in two ways
$M \leftarrow N C S o r M \to S N C$
Thus, coordination compounds containing NCS as a ligand can show linkage isomerism i.e., $[P d (C_{6} H_{5})_{2} (S C N)_{2}]$ and $[P d (C_{6} H_{5})_{2} (N C S)_{2}]$ are linkage isomers. Hence, correct choice is (a).

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