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Individual canonical structures do not exist. The molecule as such has a single structure, which is the resonance hybrid of the canonical forms.

1. In X-H---Y, X and Y both are electronegative elements (i.e. attracts the electron pair) then electron density on X will increase and on H will decrease.
2. HF form linear polymer structure due to hydrogen bonding.
3. Bond order between P-O
4. no. of bonds in all possible direction = total no. of resonating structures = 5/4 = 1.25

Correct answer: HF form linear polymer structure due to hydrogen bonding.

Solution

Option B is correct because HF forms a linear polymer structure due to strong hydrogen bonding between HF molecules. This is a well-known property of HF.

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