(b)Formaldehyde can serve as a one-carbon source if it is attacked by the Grignard reagent de-rived from bromobenzene.This sequence yields 14C-labeled benzyl alcohol, which can be oxidized to 14C-labeledbenzoic acid.(c)A direct route to 14C-labeled benzoic acid utilizes a Grignard synthesis employing 14C-labeledcarbon dioxide.19.19(a)An acid–base reaction takes place when pentanoic acid is combined with sodium hydroxide.(b)Carboxylic acids react with sodium bicarbonate to give carbonic acid, which dissociates tocarbon dioxide and water, so that the actual reaction that takes place is(c)Thionyl chloride is a reagent that converts carboxylic acids to the corresponding acylchlorides.(d)Phosphorus tribromide is used to convert carboxylic acids to their acyl bromides.Pentanoic acid3CH3CH2CH2CH2CO2HPhosphorustribromidePBr3PhosphorusacidH3PO311Pentanoyl bromide3CH3CH2
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