Why does water show a high boiling point compared to hydrogen sulphide? Give reasons for your answer.

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(N/A) Water shows a high boiling point compared to hydrogen sulphide due to the high electronegativity of oxygen $(EN = 3.5)$. Water undergoes extensive $H$-bonding,as a result of which water exists as associated molecules.
To break these hydrogen bonds,a large amount of energy is required; so,the boiling point of $H_2O$ is high. In contrast,due to the lower electronegativity of $S$,hydrogen sulphide does not undergo hydrogen bonding. $H_2S$ exists as discrete molecules and hence its boiling point is much lower than that of $H_2O$. That is why $H_2S$ is a gas at room temperature.

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Which concept best explains that $o-$nitrophenol is more volatile than $p-$nitrophenol?

Assertion : Boiling point of $p$-nitrophenol is higher than that of $o$-nitrophenol.
Reason : $p$-nitrophenol has intermolecular hydrogen bond whereas $o$-nitrophenol has intramolecular hydrogen bond.

Hydrogen bonding plays a central role in the following phenomena:
$(A)$ Ice floats in water.
$(B)$ Higher Lewis basicity of primary amines than tertiary amines in aqueous solutions.
$(C)$ Formic acid is more acidic than acetic acid.
$(D)$ Dimerisation of acetic acid in benzene.

Which of the following hydrogen bonds is the strongest?

$PH_3$ has a lower boiling point than $NH_3$. Why?

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