What is the basis of modern taxonomic studies?

Which of the following statements are correct?
$(i)$. Genus comprises a group of related species.
$(ii)$. Taxon represents a taxonomic group of individual organisms.
$(iii)$. Family comprises a group of related genera.
$(iv)$. Taxonomic category class includes related orders.

"Taxonomy without phylogeny is similar to bones without flesh" is the statement of

What is the meaning of 'taxon' in the classification of animals?

Which category comes after phylum in descending order in taxonomic hierarchy?

$A :$ Panthera is a polytypic genus.
$R :$ Panthera has specific epithets like leo,tigris,pardus.