In what respect do prontosil and Salvarsan resemble. Is there any resemblance between azo dye and prontosil? Explain.
Both prontosil and Salvarsan are classified under the same category, i.e. antibacterial (antimicrobial) drugs, they were discovered by Paul Ehrlich. The other name for Salvarsan is arsphenamine and its molecule being organoarsenic has a -As = As- double bond.
Due to the same category, they have similarities in their structure. The linkage in Salvarsan is -As = As- and prontosil contains -N = N- linkage.