Question

Rank the molecules below from least polar to most polar.

Answer 1

The dipole moment depends on charge separation between H-X, as dipole moment = q x 2d , where q is charge on H and X (halide) and the charge separation depend on electonegative of X (halide). Since, electronegativity decrease down the group from F to I, Hence the dipole moment will also decrease from F to I.

Therefore the polarity order will

HI < HBr

So HI is least polar, followed by HBr and HCl and HF is most polar.

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