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

Friedal - Craft’s acylation

Wurtz reaction

$\mathrm{RBr}+2\mathrm{Na}+\mathrm{BrR}\to \mathrm{R}-\mathrm{R}+2\mathrm{NaBr}$

Cannizzaro reaction

$2\mathrm{HCHO}\stackrel{50\mathrm{\%}\mathrm{NaCH}}{⟶}{\mathrm{CH}}_3\mathrm{OH}+{\mathrm{HCOO}}^{-}\mathrm{Na}$

In Cannizzaro reaction, no C – C bond is formed