Polyhydroxyl alcohols are alcohols with more than one hydroxyl group attached to a carbon sequence. true or false?

Answer is: True.

Example for polyhydroxyl alcohol is glycerol.
Glycerol (1,2,3-Propanetriol, glycerine or glycerin) is a simple polyol (it has three hydroxyl group) compound with formula (OH-CH₂-CH(OH)-CH₂OH or C₃H₈O₃). 
The glycerine backbone is found in all lipids known as triglycerides. (ester derived from glycerol and three fatty acids).
Glycerol is soluble in water and it is hygroscopic.

Variables,control,conclusion and finally scientific theory

Its strengthits conductivity of heat and electricity its shiny colourmalleable and ductility