(a) Which of the following species cannot act as a ligand? Give a reason. OH⁻, NH$_4^+$, CH$_3$NH$_2$, H$_2$O (b) The complex [Co(NH$_3$)$_5$(NO$_2$)]Cl$_2$ is red in colour. Give the IUPAC name of its linkage isomer.

(a) NH₄⁺ — it has no lone pair to donate (N's lone pair is bonded to the fourth H) and is positively charged. (b) Pentaamminenitrito-O-cobalt(III) chloride, [Co(NH₃)₅(ONO)]Cl₂.

CBSE Class 12 · Coordination CompoundsShort Answer

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(a) Which of the following species cannot act as a ligand? Give a reason.
OH⁻, NH

_{4}^{+}

, CH

_{3}

_{2}

, H

_{2}

O
(b) The complex [Co(NH

_{3}

)

_{5}

(NO

_{2}

)]Cl

_{2}

is red in colour. Give the IUPAC name of its linkage isomer.

Solution

(a) A ligand must donate a lone pair to the metal. NH

_{4}^{+}

has no lone pair on nitrogen (all four pairs are in N–H bonds) and its positive charge repels cations — so NH

_{4}^{+}

cannot act as a ligand. OH

^{-}

, CH

_{3}

_{2}

and H

_{2}

O all carry donor lone pairs.
(b) The linkage isomer binds nitrite through oxygen: [Co(NH

_{3}

)

_{5}

(ONO)]Cl

_{2}

—
\textbf{pentaamminenitrito-O-cobalt(III) chloride}.

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CBSE Class 12 · Coordination CompoundsShort Answer

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