Question

Coating used on raincoat are waterproof because

Answer 1

Hint Water molecules have strong hydrogen bonding And raincoat are not porous that water can enter through the surface

Complete Step by Step Solution
As we all know that raincoat is used to prevent rain
Do you ever wonder what is made up of or how it prevents rain when we wear it?
Raincoat do not allow to wet as it is waterproof
Waterproof means the surface which do not absorb water it may present on the surface
materials should have tiny holes on it so the water can absorb that is porous materials
 well water has the property of wetting the surface when it comes in contact with
water is a polar molecule means either the contains lone pairs of electrons on a central atom or having atoms with different electronegativity bonds.
As the electrons tend to be attracted to the oxygen atom giving a partial negative charge at the oxygen and partial positive charges at the hydrogen atoms.
The material is generally hydrophilic in nature the water absorbs easily.
So in case of raincoat of course there will be the cohesive force in water molecules is much stronger as compared to bulk force so water do not stay at the surface

Additional Information
The cohesive forces between molecules in a liquid are shared with the molecules.
The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension. . Surface tension could be defined as the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of the water molecules.

Note
water may be collected on the outer surface of the raincoat. The cohesive force in water molecules is much stronger so water does not stick to the raincoat surface.