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(i) Explain why the wavenumber value of CO in the majority of metal carbonyl complexes is...

(i) Explain why the wavenumber value of CO in the majority of metal carbonyl complexes is lower than that for CO gas (2143 cm-1 ). [3 marks]

(ii) Explain why the value of CO for both H3B-CO (2164 cm-1 ) and cis- [(C6F5)2Pd(CO)2] (2186 cm-1 ) is higher than that for CO gas. [2 marks]

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