Identify the group R in the following reactio | vedclass

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(B) The reaction of a Grignard reagent $(RMgBr)$ with an aldehyde $(R'CHO)$ followed by acid hydrolysis $(H_3O^+)$ yields a secondary alcohol.In the g

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$CH_3-CH_2-$

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(B) The reaction of a Grignard reagent $(RMgBr)$ with an aldehyde $(R'CHO)$ followed by acid hydrolysis $(H_3O^+)$ yields a secondary alcohol.In the given reaction,the starting material is propanal $(CH_3CH_2CHO)$ and the product is pentan$-3-$ol $(CH_3CH_2CH(OH)CH_2CH_3)$.The carbon skeleton of the product shows that an ethyl group $(CH_3CH_2-)$ has been added to the carbonyl carbon of the propanal.Therefore,the Grignard reagent used must be ethylmagnesium bromide $(CH_3CH_2MgBr)$,which implies that $R$ is the ethyl group,$CH_3CH_2-$.Thus,the correct option is $(B)$.

Identify the group $R$ in the following reaction:
$CH_3CH_2CHO \xrightarrow[2. H_3O^+]{1. RMgBr} CH_3CH_2CH(OH)CH_2CH_3$
$R$ is:

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Identify the group $R$ in the following reaction:$CH_3CH_2CHO \xrightarrow[2. H_3O^+]{1. RMgBr} CH_3CH_2CH(OH)CH_2CH_3$$R$ is: