C2H5Cl→etherNaA→1  moleBr2/773KBmajor→CH33COHCH33CO−K+Cmajor. The compound ‘C’  in the process is

A is CH3-CH2-CH2-CH3A → B is free radical substitution.The possible intermediates areCH3−CH2−C˙H−CH3more stableCH3−CH2−CH2−C˙H2less  stable∴  B  is  CH3−CH2−CHBr−CH3;B → C is elimination in presence of bulky base ∴the mechanism is E2 and Hoffmann product is the major product.∴ C is CH3−CH2−CH=CH2