Which of the following explains the viscous nature of glycerol?

Which one among the following does not have the hydrogen bond?

Why is $H_2O$ a liquid and $H_2S$ a gas?

The hydrides of the first elements in groups $15-17$, namely $NH_3$, $H_2O$ and $HF$ respectively show abnormally high values for melting and boiling points. This is due to

The boiling point of $p$-nitrophenol is higher than that of $o$-nitrophenol because:

The compound with the highest boiling point is