$A$ broad spectrum antibiotic is

Which of the following compounds does not contain a sulphur atom?

Acetoxy benzoic acid is

Which of the following is not an antibiotic?

Identify opiates from the following:
$A$. Codeine,$B$. Thymine,$C$. Epinephrine,$D$. Morphine,$E$. Thiamine,$F$. Heroin

$A$ chemist has $4$ samples of artificial sweetener $A, B, C$,and $D$. To identify these samples,he performed certain experiments and noted the following observations:
$(i)$ $A$ and $D$ both form blue-violet colour with ninhydrin.
$(ii)$ Lassaigne extract of $C$ gives positive $AgNO_{3}$ test and negative $Fe_{4}[Fe(CN)_{6}]_{3}$ test.
$(iii)$ Lassaigne extract of $B$ and $D$ gives positive sodium nitroprusside test.
Based on these observations,which option is correct?