Which of the following compounds in liquid state does not have hydrogen bonding?

$KF$ combines with $HF$ to form $KHF_2$. Which of the following species are present in this compound?

The number of $H_2O$ molecules participating in hydrogen bonding in $CuSO_4 \cdot 5H_2O$ is/are

Acetic acid exists as a dimer in benzene due to

Given below are two statements:
Statement $I$: $o$-Nitrophenol is steam volatile due to intramolecular hydrogen bonding.
Statement $II$: $o$-Nitrophenol has a high melting point due to hydrogen bonding.
In the light of the above statements,choose the most appropriate answer from the options given below:

Among $NH_{3}$,$H_{2}O$,and $HF$,which would you expect to have the highest magnitude of hydrogen bonding and why?