BH2Cl is a polar compound because the molecule is non-symmetrical.
An ionic bond is usually formed between atoms having a high magnitude of electronegativity difference between them while covalent molecules tend to have a narrower range of electronegativity difference between atoms in the molecule.
In-between the two extremes are the polar covalent bonds which result from a significant electronegativity difference but less than that required for an ionic bond.
The B-Cl bond in BH2Cl is polar and the entire molecule is non-symmetrical hence the BH2Cl is a polar compound.
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