Question

Whiich will form hydrogen bonding with itself

CH4

HBr

NH3

H2

none

Answer 1

Third option is the correct answer

NH3 will form hydrogen bonding .

Explanation :

Hydrogen bonding is a strong bond formed due to intermolecular attraction between Hydrogen and highly electronegative atoms of elements with lone pair ( mainly with N,O, F) .

Let's go through each options .

First option :

In CH4 , there are no lone pairs present in carbon moreover electronegativity difference between carbon and hydrogen is less hence it can't form hydrogen bonds .

Second option :

In HBr , although there are lone pairs of electrons present in bromine , it can't form hydrogen bonds as there are large difference in size of hydrogen and bromine atoms which makes overlapping of orbital very poor , also the difference in electronegativity of Hydrogen is not very large hence it won't form hydrogen bonds .

Third option :

In NH3 , there is one lone pair of electron present in nitrogen ( nitrogen have 5 valence electrons and only 3 are bonded with 3 hydrogen atoms). There is also a significant electronegativity difference between hydrogen and nitrogen atoms .

There is a intermolecular attraction between the lone pair and hydrogen atoms of other NH3 molecule hence forming hydrogen bonds .

Fourth option:

In H2, there won't be any hydrogen bonding as only one element (hydrogen) is present .

Therefore third option NH3 is the correct answer.