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given question

Thus is the question given in my textbook

my working This is my attempt at the question given solution

This is the solution given in the textbook.

I don't understand how a ketone is formed instead of an acid. related question This is a related question but in this a tertiary alcohol is formed instead of a ketone. What is the mechanism of formation if ketone and why is my mechanism wrong?

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There is a good explanation of the possible mechanisms of the ketone formation here which I have reproduced below. No pathway leads to an acid. Your mechanism has multiple CO insertions and only one occurs.

enter image description here

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  • $\begingroup$ What if excess CO is used, even then only 1 insertion will take place? $\endgroup$ Apr 12, 2022 at 9:57
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    $\begingroup$ Only one insertion will occur. As the reaction is run under an atmosphere of CO there will always be an excess present. $\endgroup$
    – Waylander
    Apr 12, 2022 at 11:20

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