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INORGANIC CHEMISTRY QUESTION IR Questions 1. Why do the CO stretches occur in a much higher...

INORGANIC CHEMISTRY QUESTION

IR Questions

1. Why do the CO stretches occur in a much higher frequency region than C=O stretches in organic carbonyl compounds?

2.Why do Metal-Hydride stretches occur at much lower frequency than C-H stretches?

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Answer #1

Carbon monoxide (CO ) consists of one carbon atom and one oxygen atom, connected by a triple bond that consists of two covalent bonds as well as one dative covalent bond. But C=O in organic carbonyl compounds consists of two covalent bonds and there are no dative covalent bond. So, CO stretches occur in a much higher frequency region than C=O stretches in organic carbonyl compounds.

The metals are more electroposituive than carbon and so, the electrondensity is more in the metal side than that of hydrogen side. For that reason Metal-Hydride stretches occur at much lower frequency than C-H stretches.

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