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CO acts as donor atom when reacts with certain metals. This is because CO is containing

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2 lone pair electrons on O - atom

2 lone pair electrons on C - atom

1 lone pair electrons on O - atom

1 lone pair electrons on C - atom

answer is B.

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Detailed Solution

$\overset{° °}{C} \equiv \overset{° °}{O}$ due to presence of 1 lone pair electron on carbon atom it acts as donor atom when reacts with certain metal atoms to form metal carbonyls

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