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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc038

Which of the following complex ions can show linkage isomerism?

A $[Co (NH X_{3}) X_{5} (NO X_{2})] X^{2 +}$
B $[Cr (NH X_{3}) X_{5} (SCN)] X^{2 +}$
C $[Co (en) X_{2} Cl X_{2}] X^{+}$
D $[Co (NH X_{3}) X_{5} (OH)] X^{2 +}$

Answer: A, B

Linkage isomerism needs an ambidentate ligand with two different donor atoms.

NO X_{2} X^{-}

(N or O) and

SCN X^{-}

(S or N) qualify. Chloride, ethane-1,2-diamine (two identical N donors) and hydroxide (only O is a donor) do not.

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