4. An organic compound A is formed by the reaction of ethylmagnesium iodide with a substance B, followed by the treatment with dilute aqueous acid. Compared A does not react with pyridinium chlorochromate in dichloromethane. Which one the following is a possible candidate for B?
(A) CH3CHO
(B) CH3CH2OH
(C) CH3CH2COCH3
(D) HCO2CH3
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