Question : An antibiotic contains nitro group attached to aromatic nucleus in its structure. It is
(1) penicillin.
(3) tetracycline.
(2) streptomycin.
(4) chloramphenicol.
Answer : from all above options the correct answer is “(4) chloramphenicol.” chloramphenicol is an antibiotic that contains nitro group attached to aromatic nucleus in its structure as shown in structure below –
to check other options : as we know that the penicillin structure does not contains aromatic nucleus and streptomycin contains aromatic structure but that contains amino group on it , tetracycline also contain aromatic structure but it attached OH group on it. But chloramphenicol structure found with aromatic nucleus that attached nitro group as shown in structure above.