Name the following
A covalent molecule which on dissolving forms ions.

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Solution

Covalent molecule :
A covalent molecule is the one which is formed by sharing of electron between atoms.
A polar molecule has two parts :
positive part- cation
negative part- anion
The cation and anion get separated when dissolved in water only if the molecule is polar that is the bond should be polar.
Answer:
An example of a covalent molecule that forms ions on dissolving in water is $HCl$ .
Hydrogen is less electronegative that Chlorine and the bond between them is formed by sharing of electron pair. Hence, it is a polar covalent molecule.
The ions formed after dissolving in water are- $H^{+} and {Cl}^{-}$

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