Which of the following is not used as a disinfectant?
1-2% Cetrimide
100% Alcohol
2% Lysol
5% Chloroxylene
A 70% solution of alcohol takes more time in evaporation from the surface, increasing the contact time. Therefore, 70% isopropyl alcohol is suitable for disinfection. 
100% isopropyl alcohol coagulates the protein instantly creating a protein layer that protects the remaining protein from further coagulation.