Which properties are features of a homologous series?

I.     Same general formula

II.     Similar chemical properties

III.     Gradation in physical properties

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

D

One respondent opined that the word “gradation” is difficult to understand, particularly for students not working in their mother tongue. Whilst other words could have been used, this word was used because it appears in the syllabus.