To determine which of the given compounds is an example of a hypnotic drug, we need to understand what hypnotic drugs are and then evaluate each option:
Definition of Hypnotic Drugs: Hypnotic drugs, also known as sedative-hypnotics, are a class of drugs whose primary function is to induce sleep and maintain it. They are often used in the treatment of insomnia and other sleep-related disorders.
Based on this analysis, the correct answer is Amytal, which is a hypnotic drug.
Seldane→ Antihistamine
Amytal → Barbiturate (Hypnotic)
Aspartame → Artificial sweetener
Prontosil → Antibiotics
So, the correct option is (B): Amytal.
A substance 'X' (1.5 g) dissolved in 150 g of a solvent 'Y' (molar mass = 300 g mol$^{-1}$) led to an elevation of the boiling point by 0.5 K. The relative lowering in the vapour pressure of the solvent 'Y' is $____________ \(\times 10^{-2}\). (nearest integer)
[Given : $K_{b}$ of the solvent = 5.0 K kg mol$^{-1}$]
Assume the solution to be dilute and no association or dissociation of X takes place in solution.