4: if a chiral center is formed from grignard addition, a mixture of enantiomers will be formed. the grignard reagent can attack at either the top face or bottom face of the carbonyl to give an equal mixture of chiral products. which carbonyls will give an achiral product after a grignard reaction with ch, mgbr?

Carbonyls that could give achiral products after a Grignard reaction are those that don't have a carbon with four different groups attached after the reaction. Examples include compounds like formaldehyde and acetone, which won't form chiral products after Grignard addition.

Explanation:

Carbonyls that would give achiral products after a Grignard reaction are those that do not have four different atoms or groups connected to a central carbon, which is the condition for a molecule to be chiral or to exist as enantiomers. For example, carbonyls such as formaldehyde (H2CO) or acetone (CH3COCH3) would give achiral products as they do not have four different groups attached to any single carbon after the Grignard addition of CH3MgBr.

In the case of acetone, the central carbon after Grignard addition would have two methyl groups (which are identical), a hydrogen, and an alkyl group derived from the Grignard reagent, thus not fulfilling the condition of having four different groups. As a result, this product is achiral even though it has a tetrahedral carbon after Grignard addition.

Consequently, selecting carbonyls for Grignard reactions determines whether the product will be chiral and potentially exist as a mix of enantiomers, or achiral.

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