Hi ! Rama ,
LUCAR REAGENT (LR) is a mixture of Zinc chloride (ZnCL2) and concentrated Hydrochloric acid (Hcl).It is used to chemically distinguish different degree of alcohol.
(i)When it react with 10 alcohol it get soluble in it.
(ii)when it react with 20 alcohol it form turbidity with in 5 minutes.
(iii)when it react with 30 alcohol it form turbidity immediately.
If any more problem then ask ,,,,,,,,,,
best of luck !!!”””””