$R _{ f }=\frac{\text { distance covered by substance from base line }}{\text { total distance covered by solvent from base line }}$
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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.
Choose the correct answer from the options given below :
$(A) \,2p_y +2p_y \to \pi-$ Bond formation
$(B) \,2p_x + 2p_x \to \sigma-$ Bond formation
$(C)\, 3d_{xy} + 3dp_{xy} \to \pi$ -Bond formation
$(D)\, 2s + 2p_y \to \pi-$ Bond formation
$(E)\, 3d_{xy} + 3d_{xy} \to \delta -$ Bond formation
$(F)\, 2p_s + 2p_s \to \sigma-$ Bond formation
$(I)$ $I.P.$ of $O(g)$ is less than $I.P.$ of $O_{\left( g \right)}^ - $
$(II)$ $I.P.$ of $Ne(g)$ is greater than $I.P$. of $Ne_{\left( g \right)}^ + $
$(III)$ $E.A.$ of $O_{\left( g \right)}^ + $ is greater than $E.A.$ of $O(g)$
$(IV)$ $I.P.$ of $N(g)$ is greater than $I.P.$ of $N_{\left( g \right)}^ + $