Question

Why does oxygen shows anomalous behaviour?

(1) Large size, high electronegativity 

(2) Small size, small electronegativity 

(3) Small size, high electronegativity absence of vacant d-orbital 

(4) Large size, high electronegativity presence of vacant d-orbital

Answer 1

(3) Small size, high electronegativity absence of vacant d-orbital 

Oxygen shows anomalous behaviour due to small size, high electronegativity and absence of vacant d-orbital.