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$A$. Hydrogen bonding exists when $\mathrm{H}$ is covalently bonded to the highly electro negative atom.
$B$. Intermolecular $\mathrm{H}$ bonding is present in o-nitro phenol
$C$. Intramolecular $\mathrm{H}$ bonding is present in $\mathrm{HF}$.
$D$. The magnitude of $\mathrm{H}$ bonding depends on the physical state of the compound.
$E$. H-bonding has powerful effect on the structure and properties of compounds.
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$I.$ They activate many enzymes
$II.$ They participate in the oxidation of glucose to produce $ATP$
$III.$ Along with sodium ions, they are responsible for the transmission of nerve signals