Identify the product ' B ' in the following sequence of reactions.
Methyl magnesium bromide $\xrightarrow{\text{CdCl}_2} \text{A} \xrightarrow{\text{CH}_3\text{COCl}} \text{B}$}
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Dialkyl cadmium reagents are less reactive than Grignard reagents and are used to prepare ketones without further reduction to alcohols.