The property which regularly increases down the group in the periodic table is : (a) lionization enthalpy (b) Electronegativity (c) Reducing character (d) Electron gain enthalpy.

Question: 

The property which regularly increases down the group in the periodic table is : 

(a) lionization enthalpy 

(b) Electronegativity 

(c) Reducing character 

(d) Electron gain enthalpy.

Answer: option (c) " Reducing character"

Explanation:

The metallic character is used to define the chemical property that metallic elements present. Generally, metals tend to lose electrons to form cations. Nonmetals tend to gain electrons to form anions. They also have a high oxidation potential therefore they are easily oxidized and are strong reducing agents. Thus the property which regularly increases down the group in the periodic table is Reducing nature. 

Hence, option (c) " Reducing character" is the correct answer.