Ans :- Option (D) i.e.
CH3CH2COOH is the correct
Molecule which is polar and gives
maximum number of ions in solution will have
highest surface tension, because molecules or ions
can then have the maximum amount of force among them. We know
tension = Force / Net circumference, therefore, maximum force
leads to maximum surface tension. Since
CH3CH2COOH is polar and
gives maximum ions in the solution, so it will have highest surface
Hence Option (D) is the correct answer.