Among the following,the number of tranquilizer/s is/are $.......$.
$A.$ Chlordiazepoxide
$B.$ Veronal
$C.$ Valium
$D.$ Salvarsan

What is the use of sodium alkyl benzene sulfonate?

The correct statement about $(A), (B), (C)$ and $(D)$ is:

The compound which causes antidepressant action on the central nervous system is

$A$ 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?

Among the following,the incorrect statement about chloramphenicol is: