Which one of the following reactions will not result in the formation of a carbon-carbon bond?

The correct option is D Cannizzaro reaction. Cannizzaro reaction is a chemical reaction that involves the base-induced disproportionation of an aldehyde lacking a hydrogen atom in the alpha position. The oxidation product is a salt of a carboxylic acid and the reduction product is an alcohol. The Reimer Tiemann reaction is a chemical reaction used for the ortho-formylation of phenols with the simplest example being the conversion of phenol to salicylaldehyde. From the above examples it is clear that in the Cannizzaro reaction, C-C bond formation won't take place. Option D is correct.