**3.2 Alcohol**

Alcohols like methanol, ethanol, and isopropyl alcohol have similar solvent properties such as solvent strengths, dielectrics, critical points, and hydrogen donating abilities. However, due to its nontoxic nature, ethanol has ascended to the top [12]. Alkanes (heptane, hexane) and simple alcohols (methanol, ethanol) are healthier for the environment than dioxane, acetonitrile, acids, formaldehyde, and tetrahydrofuran [13]. The main disadvantage of alcohol is that they are flammable and some of them are toxic (i.e., methanol). In addition, extended exposure to their vapors can also lead to health problems.
