Thank you for reporting, we will resolve it shortly
Q.
Which of the following hydrogen bond is strongest in vapour phase?
NTA AbhyasNTA Abhyas 2020Chemical Bonding and Molecular Structure
Solution:
atom which is associated with $H$ should be more electronegative so positive charge $\uparrow$ on $H$ -atom & atom which is lone pair donor should be less electronegative so, that it can donate lone pair