use retrosynthetic analysis to suggest a way to synthesize 3-hexanol using the grignard reaction. identify the aldehyde and grignard reagents needed. a six carbon chain has an alcohol substituent on carbon 3. a. the aldehyde should be: 2 methyl butyraldehyde. a carbon is bonded to an aldehyde carbonyl, a methyl group, an ethyl group and a hydrogen. an aldehyde is bonded to an isobutyl group. benzaldehyde. an aldehyde is bonded to a phenyl group. butyraldehyde. an aldehyde is bonded to a propyl group. acetaldehyde. an aldehyde is bonded to a methyl group. a phenyl group is bonded to c h 2 which is bonded to an aldehyde. b. the grignard reagent should be: a phenyl bonded to c h 2 m g b r. isopropyl magnesium bromide. phenyl magnesium bromide. isobutyl magnesium bromide butyl magnesium bromide. ethyl magnesium bromide.