Give the following reactions for the formation of: (i) carbonylate anion by addition of alkali or reduction (any two) (ii) carbonyl hydrides (any one) (iii) carbonyls by displacement of CO by other ligands (any two).

(i) Formation of carbonylate anion by addition of alkali or reduction:

a. Addition of alkali: Ni(CO)4 + 2NaOH → Na2[Ni(CO)4] + 2H2O

In this reaction, the metal carbonyl compound Ni(CO)4 reacts with sodium hydroxide (NaOH) to form the sodium salt of the tetracarbonylnickelate(II) anion, Na2[Ni(CO)4].

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