Question

Among the following which property is commonly exhibited by a covalent compound
A. High solubility in water
B. High electrical conductance
C. Low boiling point
D. High melting point

Answer 1

Hint: Covalent compounds show extreme resistance to heat and electricity.
They maintain low boiling points as they remain in a gaseous state at room temperature. These compounds transform into liquid from a solid state easily.

Complete step by step solution:A chemical bond is formed by the atoms which want to attain stability.
When pairs of electrons are shared by atoms
a covalent bond is created.
Atoms will get covalently bonded with other atoms to attain more stability.
When two atoms of the same element create a covalent bond the shared electrons are shared equally among the atoms. This is a nonpolar bond.
When atoms of distinct elements share electrons through covalent bonding, the electron will be shifted more toward the atom which carries higher electronegativity. This is a polar covalent bond.
Covalent compounds typically possess lower melting and boiling point.
It does not prefer to dissolve in water.
These compounds can be in a gas, liquid, or solid-state and are bad conductors of electricity or heat.
Here in this question, we are given different properties and we have to answer which is a property of a covalent compound.

A. High solubility in water
These compounds are nonpolar. Water is a polar solvent. We know that polar molecule dissolves in a polar solvent and nonpolar
molecule dissolves in a nonpolar solvent.
So, covalent compounds are not soluble in water.
So, A is incorrect.

B. High electrical conductance
These compounds do not conduct electricity due to the absence of ions.
If ions would have been present, the movement of ions would have caused the conduction of electricity.
These compounds dissociate into molecules.
So, B is incorrect.

C. Low boiling point
These compounds have a low boiling point as the bond strength is less. So, less energy is required for the process of boiling.
So, it has a low boiling point.
So, C is correct.

D. High melting point
These compounds have a low melting point as the bond strength is less. So, less energy is required for the process of boiling.
So, it has a low boiling point.
So, D is incorrect.

So, option C is correct.

Note: Covalent compounds are bad conductors of electricity or heat but graphite is a peculiar case.
It is a good conductor of electricity as it carries delocalized electrons.
The structure of graphite is such that every carbon atom is bonded to three carbon atoms by covalently bonding. The remaining electron is free and thus conducts electricity.