$E_{2s}({Li}) < E_{2p}({Li})$

$E_{2s}({H}) = E_{2p}({H})$

$E_{2p}({H}) < E_{2s}({Li})$

$E_{2s}({H}) > E_{2s}({Li})$

X is used for sterilizing drinking water.

Y has a planar structure.

Z is used in the enrichment of $^{235}$U.

Y is a stronger Lewis base than ammonia.

The bond order of X⁺ is 1.5.

Valence d-orbitals of the metal ion in X⁺Y^- has 5 electrons.

PtF₆ acts as an oxidant in this reaction.

PtF₆ acts as a fluorinating agent in this reaction.

S on warming with ammoniacal AgNO₃ results in the formation of silver mirror.

Q on treatment with Cl₂(excess)/UV gives gammaxane.

T is a heterocyclic compound.

R on acid catalyzed intramolecular cyclization followed by treatment with Zn-Hg/HCl gives 9,10-dihydroxyanthracene.