To solve this problem, we need to identify the type of reaction shown in the image.$\\$The reaction involves:$\\$• A sodium alkoxide ($$CH$_3$C(ONa)(CH$_3$)$$CH$_3$)$\\$• An alkyl halide ($$CH$_3$CH$_2$Cl)$\\$The product is an ether ($$CH$_3$C(OCH$_2$CH$_3$)(CH$_3$)$$CH$_3$)$$, with NaCl as a byproduct.$\\$This reaction is known as the Williamson ether synthesis, which is a method to prepare ethers.$\\$In this reaction:$\\$• The sodium alkoxide acts as a nucleophile.$\\$• It attacks the alkyl halide, displacing the halide ion (Cl$^-$) and forming an ether.$\\$Therefore, the correct option is:$\\$Option 4: Williamson synthesis