In which of the following molecules does hydrogen bonding occur? Why?
$CH_3OH, CH_3COOH, CH_4, Cl, HF, C_6H_6, NH_3, NF_3$

(N/A) Hydrogen bonding occurs in $CH_3OH, CH_3COOH, HF,$ and $NH_3$.
This is because these molecules contain a partially positively charged hydrogen atom $(H^{\delta+})$ bonded to a highly electronegative atom (like $O, N,$ or $F$),allowing for the formation of a hydrogen bond with another electronegative atom.