Question

In which of the following compounds does hydrogen bonding occur?
A \[Si{{H}_{4}}\]​
B LiH
C HI
D \[N{{H}_{3}}\]​

Answer 1

Hint: A hydrogen atom that is bound to a highly electronegative atom and another highly electronegative atom that is close by interact with one another to form hydrogen bonds, which are an unique kind of attractive intermolecular interactions. This process is known as hydrogen bonding.

Complete step-by-step answer:When a hydrogen atom is joined to an extremely electronegative atom in a molecule, it draws the shared pair of electrons more and the molecule's one end changes slightly positive and slightly negative as a result. A weak link between the molecules is created when the positive end of one is drawn to the negative end of the other. The hydrogen bond is the name of this bond.
As a result of hydrogen bonding, a hydrogen atom simultaneously forms a covalent bond with one electronegative atom and a hydrogen bond with the other. These are the prerequisites for hydrogen bonding:
A strongly electronegative atom connected to the hydrogen atom must be present in the molecule. The degree of polarisation of the molecule increases with increasing electronegativity.
The electronegative atom should have a tiny size. The strength of the electrostatic attraction increases with decreasing size.
When a hydrogen (H) atom attached to a highly electronegative element, such as nitrogen (N), oxygen (O), or fluorine (F), experiences attraction to some other adjacent highly electronegative atom, it forms a hydrogen bond, which is an electrostatic attraction between polar groups.
As a result, only hydrogen bonding in ammonia is visible.

Option ‘D’ is correct

Note: Nitrogen is one of the most electronegative atoms of the periodic table. It also have a small size which enhances its ability to pull shared pairs of electrons towards itself. Each ammonia molecule can form H-Bonds, one with N and three with 3-H-atoms of ammonia.