The form of sugar transported through phloem is

1.  glucose

2.  fructose

3.  sucrose

4.  ribose

(c)Sucrose a disaccharide sugar is transported through phloem. It comprises of 2 units of glucose joined by a-1-4 linkage. It is the most inactive form of sugar so used in the transport of food.
Glucose because of presence of CHO group is reactive sugar.
Fructose is founds in fruits and ribose is present in nucleic acids
Page 190, XI NCERT