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RCOCI fails to give keton when treated w...

RCOCI fails to give keton when treated with R-Mg-X but with `R_(2)Cd` , a ketone is obtained easily. Expalain.

Text Solution

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No, doubt, Gringand reagent reacts with acid halide to from a ketone but Grignard reagent further reacts with ketone readily and ultimately forms is tertiary alcohol.

`R_(2)Cd` reacts with RCOCI and forms ketone easily as Cd of `R_(2)Cd` is sufficiently electrophilic to initiate the reaction.
`RCOCI+R_(2)Cdrarr[R_(2)Cdoverset(-)CI+Roverset(-)C=O]rarrRCOR+RCdCI`
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