Which of the following interactions lies in the range of $8 - 42 \, kJ/mol$?

In which of the following,the compounds are correctly arranged in the decreasing order of boiling points?

In which of the following is intramolecular $H$-bonding absent?

What are the two main requirements for the formation of a hydrogen bond?

The hydrogen bond strength will be highest for

Number of molecules from the following which can exhibit hydrogen bonding is $..........$ (nearest integer).
$CH_3OH, H_2O, C_2H_6, C_6H_6, \text{o-nitrophenol}, HF, NH_3$