How does sodium chloride have a high melting point and conduct electricity when dissolved in water?

Hint: We must remember that the sodium chloride is popularly called as common salt. The chemical formula of sodium chloride is $NaCl$ . In salt, the first crystal melts at a given temperature, the temperature is called the melting point of the salt. Conductivity is dependent on the nature of the compound. If one compound is ionic, it necessarily conducts the electricity. In covalent molecules the conductivity property became very less and sometimes zero. The molecular formula of water is ${H_2}O$ .

Complete step by step answer:
We must remember that the sodium chloride is an ionic compound. It is formed by the attraction of force between sodium ion $N{a^ + }$ and chloride ion $C{l^ - }$. Due to this kind of attraction, the ionic bond became very strong. The attraction of force between positive ion $N{a^ + }$ and negative ion $C{l^ - }$. This strong ionic bond in sodium chloride has a high melting point.
From the above discussion, we know sodium chloride has a melting point.
As we know that when sodium chloride is dissolved in water to form sodium ion $N{a^ + }$ and chloride ion $C{l^ - }$. These ions flow in water. These sodium and chloride ions flow in water, this flow ions in water conduct the electricity. The movement of positive ions and negative ions create and conduct electricity.
$NaCl\xrightarrow{{water}}N{a^ + } + C{l^ - }$
From the above statement, we conclude that sodium chloride conducts electricity when dissolved in water.

Note:
We know that all the ionic bonds are formed due to the force of attraction between the cation and anion. The charged ions are moved in water and are used to conduct the electricity. Hence, water is called a good conductor. We need to know that sodium chloride is one of the strong electrolytes in water. Sodium chloride is crystalline solid and isotropic in nature.