The electrons identified by quantum numbers n and l :
(a) n = 4, $$l$$ = 1
(b) n = 4, $$ l$$ = 0
(c) n = 3, $$l$$ = 2
(d) n = 3, $$l$$ = 1
Can be placed in order of increasing energy as :

The increasing order of the ionic radii of the given isoelectronic species is :

Ortho–Nitrophenol is less soluble in water than p– and m– Nitrophenols because :

In which of the following pairs the two species are not isostructural ?