Hydrogen bonding is present in:

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(D) In $KHF_2$,the anion is $[F-H-F]^-$,which contains a strong symmetric hydrogen bond between the two fluoride ions.In $KH_2PO_4$,the phosphate unit

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Both $(A)$ and $(B)$

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(D) In $KHF_2$,the anion is $[F-H-F]^-$,which contains a strong symmetric hydrogen bond between the two fluoride ions.In $KH_2PO_4$,the phosphate units are linked by intermolecular hydrogen bonds,forming a polymeric structure.In $KH_2PO_2$,the phosphorus atom is bonded to two hydrogen atoms directly,and there are no acidic protons available to form hydrogen bonds.Therefore,both $(A)$ and $(B)$ exhibit hydrogen bonding.

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