Rank the following solutions from least polar to most polar. Rank on a scale of 1-4: 1 being the least polar and 4 being the most polar.

(a) 50% isopropanol/H2O,
(b) 25% isopropanol/H2O,
(c) pure water,
(d) 70% isopropanol/H2O.

The answer is given below

Explanation:

When electronegativity difference arises between the bonded atoms, then a molecule is polar.

When electros are shared equally between the bonded atoms or when the polar bonds in a bigger molecule cancels out each other, then a a molucule is non polar.

(a) 50% isopropanol/H2O,--- 2 (second least polar)

(b) 25% isopropanol/H2O, 3 (third least polar)

(c) pure water is 4 (most polar)

(d) 70% isopropanol/H2O. 1 (least polar)

it's c. elements are placed in rows based on how may valencies electrons have.