27. Answer ALL parts of this question. (a) (b) (c) The secondary alcohol shown below can be synthesised by reacting benzaldehyde (C6HSCHO) with methyl magnesium bromide (CH3MgBr), followed by the addition of aqueous acid (H*/H₂O). H -C-CH3 I он Outline, using curly arrows, the mechanism of this reaction. Suggest, without giving details of mechanism, an alternative pair of starting materials (one is a carbonyl compound and the other is a Grignard reagent) that could also be used to synthesise this compound. The naturally occurring cyanohydrin, mandelonitrile, can also be synthesised from benzaldehyde. State what other reagents would be needed in this synthesis and show the mechanism that leads to the formation of the mandelonitrile. H OH CN mandelonitrile

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