$$\alpha$$-D-(+)-glucose and $$\beta$$-D-(+)-glucose are

Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives

The organic chloro compound, which shows complete stereochemical inversion during a S_N2 reaction, is

The coordination number and the oxidation state of the element ‘E’ in the complex [E(en)₂(C₂O₄)]NO₂ (where (en) is ethylene diamine) are, respectively,